Yesterday, it was reported that Blac Chyna was seeking full custody of her child with Tyga, citing T-Raww's bad judgement in dating minor Kylie Jenner, as well as Jenner's immaturity.

But sources close to the situation reported another reason Chyna wants to drag Tyga into court: She's bitter that the rapper picked an under-aged reality TV starlet over her.

Not surprisingly, Tyga is in the "bitter" camp. TMZ has learned that Tyga believes Chyna is only seeking full custody of 2-year old King Cario to spite him. He also thinks he's the better parent, and Chyna neglects their son to go on her twerking adventures.

Tyga and Chyna don't have a formal custody arrangement, so it seems only the lawyers are going to be winners here.