diff --git a/src/grp_query_drv_dummy.cc b/src/grp_query_drv_dummy.cc
index febefed..23c11c7 100644
--- a/src/grp_query_drv_dummy.cc
+++ b/src/grp_query_drv_dummy.cc
@@ -1,4 +1,5 @@
 #include "grp_query_drv_dummy.hh"
+#include "utils.hh"
 #include "pEpLog.hh"
 #include "listmanager_dummy.hh"
 #include <pEp/message_api.h>
@@ -18,7 +19,38 @@ namespace pEp {
     PEP_STATUS GroupQueryDriverDummy::group_query_groups(PEP_SESSION session, identity_list **groups) noexcept
     {
         pEpLogClass("called");
-        return PEP_STATUS_OK;
+        PEP_STATUS status = PEP_UNKNOWN_ERROR;
+
+        if (!session) {
+            status = PEP_ILLEGAL_VALUE;
+        } else {
+            vector<string> lists_queried;
+            try {
+                lists_queried = lmd.lists();
+                status = PEP_STATUS_OK;
+            } catch (const exception &e) {
+                pEpLogClass(Utils::nested_exception_to_string(e));
+                status = PEP_UNKNOWN_ERROR;
+            } catch (...) {
+                pEpLogClass("unknown exception");
+                status = PEP_UNKNOWN_ERROR;
+            }
+
+            if (status == PEP_STATUS_OK) {
+                ::identity_list *idl_groups = ::new_identity_list(nullptr);
+                for (const string &addr_list : lists_queried) {
+                    ::pEp_identity *grp_ident = ::new_identity(
+                        addr_list.c_str(),
+                        nullptr,
+                        nullptr,
+                        nullptr);
+                    ::update_identity(session, grp_ident);
+                    identity_list_add(idl_groups, grp_ident);
+                }
+                *groups = idl_groups;
+            }
+        }
+        return status;
     }
 
     PEP_STATUS GroupQueryDriverDummy::group_query_manager(
@@ -27,7 +59,38 @@ namespace pEp {
         pEp_identity **manager) noexcept
     {
         pEpLogClass("called");
-        return PEP_STATUS_OK;
+        PEP_STATUS status = PEP_UNKNOWN_ERROR;
+
+        if (!session || !group) {
+            status = PEP_ILLEGAL_VALUE;
+        } else {
+            const string addr_list{ group->address };
+            string addr_manager{};
+            try {
+                addr_manager = lmd.moderator(addr_list);
+                status = PEP_STATUS_OK;
+            } catch (const ListDoesNotExistException &e) {
+                pEpLogClass(Utils::nested_exception_to_string(e));
+                status = PEP_GROUP_NOT_FOUND;
+            } catch (const exception &e) {
+                pEpLogClass(Utils::nested_exception_to_string(e));
+                status = PEP_UNKNOWN_ERROR;
+            } catch (...) {
+                pEpLogClass("unknown exception");
+                status = PEP_UNKNOWN_ERROR;
+            }
+
+            if (status == PEP_STATUS_OK) {
+                ::pEp_identity *manager_queried = ::new_identity(
+                    addr_manager.c_str(),
+                    nullptr,
+                    nullptr,
+                    nullptr);
+                ::update_identity(session, manager_queried);
+                *manager = manager_queried;
+            }
+        }
+        return status;
     }
 
     PEP_STATUS GroupQueryDriverDummy::group_query_members(
@@ -36,6 +99,45 @@ namespace pEp {
         identity_list **members) noexcept
     {
         pEpLogClass("called");
-        return PEP_STATUS_OK;
+        PEP_STATUS status = PEP_UNKNOWN_ERROR;
+
+        if (!session || !group) {
+            status = PEP_ILLEGAL_VALUE;
+        } else {
+            if (!Utils::is_c_str_empty(group->address)) {
+                status = PEP_ILLEGAL_VALUE;
+            } else {
+                const string addr_grp{ group->address };
+                vector<string> members_queried;
+                try {
+                    members_queried = lmd.members(addr_grp);
+                    status = PEP_STATUS_OK;
+                } catch (const ListDoesNotExistException &e) {
+                    pEpLogClass(Utils::nested_exception_to_string(e));
+                    status = PEP_GROUP_NOT_FOUND;
+                } catch (const exception &e) {
+                    pEpLogClass(Utils::nested_exception_to_string(e));
+                    status = PEP_UNKNOWN_ERROR;
+                } catch (...) {
+                    pEpLogClass("unknown exception");
+                    status = PEP_UNKNOWN_ERROR;
+                }
+
+                if (status == PEP_STATUS_OK) {
+                    ::identity_list *idl_members = ::new_identity_list(nullptr);
+                    for (const string &addr_member : members_queried) {
+                        ::pEp_identity *member_ident = ::new_identity(
+                            addr_member.c_str(),
+                            nullptr,
+                            nullptr,
+                            nullptr);
+                        ::update_identity(session, member_ident);
+                        identity_list_add(idl_members, member_ident);
+                    }
+                    *members = idl_members;
+                }
+            }
+        }
+        return status;
     }
 } // namespace pEp
\ No newline at end of file