How to see post of all Team Members

I have created a two table named Team and team_user. Here is the Schema of the both table

            Team Table
---------------------------------
| id | team_name | user_id      |
---------------------------------
|  1 | Developer |     5        |
|  2 | Designer  |     6        |
|  3 | Test      |     7        |
|  4 | Test 2    |     8        |
---------------------------------

               Team_User Table
-------------------------------------------------
| id | team_id   |   tl_id      |   user_id     |
-------------------------------------------------
|  1 |    1      |     5        |   25          |
|  2 |    2      |     6        |   35          |
|  3 |    2      |     7        |   12          |
|  4 |    3      |     8        |   13          |
-------------------------------------------------

tl_id (Team Leader User ID) user_id (User ID of user who is under Team leader)

A Team leader can have multiple user under him. I want to show All the post of his team member in Team Leader view.

So for e.g if Team Leader named abc has a member named def under him and Another person named ghi is under def. So i want to show all post of def and ghi under abc Leaders view.

Till now i have done this -

   $user = auth()->user();
    $teams =  DB::table('team_user')->where('tl_id', $user->id)->get();
    $tl = array();
    foreach ($teams as $team) {
        $tl[] = $team->user_id;
    }
    $tl[] = auth()->user()->id; 

    $posts = DB::table('post')->where('status',1)->Where(function ($query) use($tl) {
            for ($i = 0; $i < count($tl); $i++){
                $query->orwhere('user_id', '=', $tl[$i]);
            }
        })->get();

From above code i can only get the post list of def under abc. How can i get the post ghi too and so on under him?

via Chebli Mohamed