diff --git a/man/signal-cli-dbus.5.adoc b/man/signal-cli-dbus.5.adoc
index 26f66aba..f967830f 100755
--- a/man/signal-cli-dbus.5.adoc
+++ b/man/signal-cli-dbus.5.adoc
@@ -108,14 +108,6 @@ Note that quitting a group will not remove the group from the getGroupIds comman
 
 Exceptions: GroupNotFound, Failure
 
-isMember(groupId<ay>) -> active<b>::
-isMember(base64GroupId<s>) -> active<b>::
-* groupId       : Byte array representing the internal group identifier
-* base64GroupId : String representing the internal group identifier in Base64 format
-* active        : Boolean representing whether you are a member of the group
-
-Exceptions: GroupNotFound
-
 sendEndSessionMessage(recipients<as>) -> <>::
 * recipients : String array of phone numbers
 
@@ -266,6 +258,32 @@ base64GroupId : String representing the internal group identifier in Base64 form
 
 Exception: Failure if base64GroupId or groupId is malformed; GroupNotFound
 
+isMember(groupId<ay>) -> active<b>::
+isMember(base64GroupId<s>) -> active<b>::
+isMember(groupId<ay>, members<as>, setMemberStatus<b>) -> memberList<as>::
+isMember(base64GroupId<s>, members<as>, setMemberStatus<b>) -> memberList<as>::
+* groupId         : Byte array representing the internal group identifier
+* base64GroupId   : String representing the internal group identifier in Base64 format
+* members         : Phone numbers of users to add to or remove from group
+* setMemberStatus : true for add to group members; false for remove from group members
+* active          : Boolean representing whether you are a member of the group
+* memberList      : List of members after command execution
+
+Exceptions: GroupNotFound, Failure
+
+isAdmin(groupId<ay>) -> admin<b>::
+isAdmin(base64GroupId<s>) -> admin<b>::
+isAdmin(groupId<ay>, admins<as>, setAdminStatus<b>) -> adminList<as>::
+isAdmin(base64GroupId<s>, admins<as>, setAdminStatus<b>) -> adminList<as>::
+* groupId        : Byte array representing the internal group identifier
+* base64GroupId  : String representing the internal group identifier in Base64 format
+* admins         : Phone numbers of users to grant or deny admin status
+* setAdminStatus : true for add to group admins; false for remove from group admins
+* admin          : Boolean representing whether you are an admin of the group
+* adminList      : List of admins after command execution
+
+Exceptions: GroupNotFound, Failure
+
 getGroupMembers(groupId<ay>) -> members<as>::
 getGroupMembers(base64GroupId<s>) -> members<as>::
 * members       : String array with the phone numbers of all active members of a group
diff --git a/src/main/java/org/asamk/Signal.java b/src/main/java/org/asamk/Signal.java
index b025066e..8a35f533 100644
--- a/src/main/java/org/asamk/Signal.java
+++ b/src/main/java/org/asamk/Signal.java
@@ -233,8 +233,15 @@ public interface Signal extends DBusInterface {
     boolean isGroupBlocked(final byte[] groupId)  throws Error.GroupNotFound, Error.Failure;
     boolean isGroupBlocked(final String base64GroupId)  throws Error.GroupNotFound, Error.Failure;
 
-    boolean isMember(final byte[] groupId)  throws Error.GroupNotFound, Error.Failure;
-    boolean isMember(final String base64GroupId)  throws Error.GroupNotFound, Error.Failure;
+    boolean isMember(final byte[] groupId) throws Error.GroupNotFound, Error.Failure;
+    boolean isMember(final String base64GroupId) throws Error.GroupNotFound, Error.Failure;
+    List<String> isMember(final byte[] groupId, List<String>members, boolean setMemberStatus) throws Error.GroupNotFound, Error.Failure;
+    List<String> isMember(final String base64GroupId, List<String>members, boolean setMemberStatus) throws Error.GroupNotFound, Error.Failure;
+
+    boolean isAdmin(final byte[] groupId) throws Error.GroupNotFound, Error.Failure;
+    boolean isAdmin(final String base64GroupId) throws Error.GroupNotFound, Error.Failure;
+    List<String> isAdmin(final byte[] groupId, List<String>admins, boolean setAdminStatus) throws Error.GroupNotFound, Error.Failure;
+    List<String> isAdmin(final String base64GroupId, List<String>admins, boolean setAdminStatus) throws Error.GroupNotFound, Error.Failure;
 
     void joinGroup(final String groupLink) throws Error.Failure;
 
diff --git a/src/main/java/org/asamk/signal/dbus/DbusSignalImpl.java b/src/main/java/org/asamk/signal/dbus/DbusSignalImpl.java
index 1e68159e..1400af73 100644
--- a/src/main/java/org/asamk/signal/dbus/DbusSignalImpl.java
+++ b/src/main/java/org/asamk/signal/dbus/DbusSignalImpl.java
@@ -1083,8 +1083,6 @@ public class DbusSignalImpl implements Signal {
         }
     }
 
-
-
     @Override
     public boolean isRegistered(String number) {
         if (number.isEmpty()) {
@@ -1260,7 +1258,6 @@ public class DbusSignalImpl implements Signal {
         DbusSignalControlImpl.verifyWithPin(number, verificationCode, pin);
     }
 
-
     // Create a unique list of Numbers from Identities and Contacts to really get
     // all numbers the system knows
     @Override
@@ -1447,6 +1444,156 @@ public class DbusSignalImpl implements Signal {
         }
     }
 
+    @Override
+    public List<String> isMember(final byte[] groupId, List<String>members, boolean setMemberStatus) {
+        GroupInfo group = null;
+        try {
+            group = m.getGroup(GroupId.unknownVersion(groupId));
+            if (group == null) {
+                throw new Error.GroupNotFound("Error finding group");
+            }
+            if (setMemberStatus) {
+                var results = m.updateGroup(group.getGroupId(),
+                        null,
+                        null,
+                        members,
+                        null,
+                        null,
+                        null,
+                        false,
+                        null,
+                        null,
+                        null,
+                        null,
+                        null);
+            } else {
+                    var results = m.updateGroup(group.getGroupId(),
+                            null,
+                            null,
+                            null,
+                            members,
+                            null,
+                            null,
+                            false,
+                            null,
+                            null,
+                            null,
+                            null,
+                            null);
+            }
+            return getGroupMembers(groupId);
+        } catch (NotAGroupMemberException | InvalidNumberException | AssertionError | IOException | AttachmentInvalidException e) {
+            throw new Error.Failure(e.getMessage());
+        } catch (GroupNotFoundException e) {
+            throw new Error.GroupNotFound("Group not found.");
+        }
+    }
+
+    @Override
+    public List<String> isMember(final String base64GroupId, List<String> members, boolean setMemberStatus) {
+        GroupInfo group = null;
+        byte[] groupId = null;
+        try {
+            groupId = GroupId.fromBase64(base64GroupId).serialize();
+            return isMember(groupId, members, setMemberStatus);
+        } catch (GroupIdFormatException e) {
+            throw new Error.Failure("Incorrect format: " + e.getMessage());
+        }
+    }
+
+    @Override
+    public boolean isAdmin(final byte[] groupId) {
+        GroupInfo group = null;
+        try {
+            group = m.getGroup(GroupId.unknownVersion(groupId));
+        } catch (AssertionError e) {
+            throw new Error.Failure(e.getMessage());
+        }
+        if (group == null) {
+            throw new Error.GroupNotFound("Error finding group");
+        } else {
+             return group.getAdminMembers().contains(m.getSelfRecipientId());
+        }
+    }
+
+    @Override
+    public boolean isAdmin(final String base64GroupId) {
+        GroupInfo group = null;
+        byte[] groupId = null;
+        try {
+            groupId = GroupId.fromBase64(base64GroupId).serialize();
+        } catch (GroupIdFormatException e) {
+            throw new Error.Failure("Incorrect format: " + e.getMessage());
+        }
+        try {
+            group = m.getGroup(GroupId.unknownVersion(groupId));
+        } catch (AssertionError e) {
+            throw new Error.Failure(e.getMessage());
+        }
+        if (group == null) {
+            throw new Error.GroupNotFound("Error finding group");
+        } else {
+             return group.getAdminMembers().contains(m.getSelfRecipientId());
+        }
+    }
+
+    @Override
+    public List<String> isAdmin(final byte[] groupId, List<String>admins, boolean setAdminStatus) {
+        GroupInfo group = null;
+        try {
+            group = m.getGroup(GroupId.unknownVersion(groupId));
+            if (group == null) {
+                throw new Error.GroupNotFound("Error finding group");
+            }
+            if (setAdminStatus) {
+                var results = m.updateGroup(group.getGroupId(),
+                        null,
+                        null,
+                        null,
+                        null,
+                        admins,
+                        null,
+                        false,
+                        null,
+                        null,
+                        null,
+                        null,
+                        null);
+            } else {
+                    var results = m.updateGroup(group.getGroupId(),
+                            null,
+                            null,
+                            null,
+                            null,
+                            null,
+                            admins,
+                            false,
+                            null,
+                            null,
+                            null,
+                            null,
+                            null);
+            }
+            return getGroupAdminMembers(groupId);
+        } catch (NotAGroupMemberException | InvalidNumberException | AssertionError | IOException | AttachmentInvalidException e) {
+            throw new Error.Failure(e.getMessage());
+        } catch (GroupNotFoundException e) {
+            throw new Error.GroupNotFound("Group not found.");
+        }
+    }
+
+    @Override
+    public List<String> isAdmin(final String base64GroupId, List<String> admins, boolean setAdminStatus) {
+        GroupInfo group = null;
+        byte[] groupId = null;
+        try {
+            groupId = GroupId.fromBase64(base64GroupId).serialize();
+            return isAdmin(groupId, admins, setAdminStatus);
+        } catch (GroupIdFormatException e) {
+            throw new Error.Failure("Incorrect format: " + e.getMessage());
+        }
+    }
+
     @Override
     public void uploadStickerPack(String stickerPackPath) {
         File path = new File(stickerPackPath);