Show a group project to multiple users mysql

I have two tables the group_table where all the groups information is stored.

And i have a group_person_table where all id's which correlate to groups

I only want to display the group information to multiple users if they match in group_person_table

the database looks like this :

Group_table person_id, group_id, groupname, groupdesc.

Group_person_table person_group_id, group_id, person_id

currently i only have the following query:

"SELECT * FROM group_table WHERE person_id = $person_id" IN (SELECT person_id FROM group_person_table WHERE person_id =$person_id);

I currently am able to display all of the groups to all of the users but i only want to display the groups to the users if they're the same in group_person_table so user A and B are in group A so they both see Group A, if user A is in Group B, then User B wont see group B!

I'm displaying calling upon the data in OOP

public function get_project($person_id){ //$sql3="SELECT * FROM group_table WHERE person_id = $person_id "; $sql3="SELECT * FROM group_table WHERE person_id = $person_id"; $results = mysqli_query($this->db, $sql3);