Sources connected with Tyga tell TMZ he's alarmed at Blac Chyna's arrest in Austin last week, and is worried her problems with drugs and alcohol might be putting 3-year-old King at risk.
Tyga has already filed legal docs to change the custody arrangement, and now thinks Chyna 's recent run-in proves he's the more responsible parent and he should have King during the week, allowing her visitation on weekends.
Rob Kardashian posted a video of him playing with King (Chyna's son) and source says Tyga is cool with Rob's relationship with Chyna and has no fear about being replaced as a father by anyone, including Rob.
Tyga thinks Rob is a good guy and has no problem with him. Chyna on the other hand ...
