Davids father contacts his son, and if it wasn´t for Maddie, he probably wouldn´t have been succesful in finding him.
The beginning of this episode, is also the beginning of a new season, and now we know that great things are about to happen in this season. Last season ended with D & M driving away in different directions, and now they´re back. Obviosly they missed each other, Maddie even says it out loud, and David had bought his boss maracas. But then it all gets worse, as David finds out who his father is marrying, it´s a woman Dave Jr had had relations with before. He turns to the bottle for comfort as he thinks noone (Maddie) could understand him. And he´s right.
Anyhoo...It ends well. :)