On this Sunday's Rob & Chyna, Rob Kardashian and Blac Chyna travel to Washington, D.C. to visit her mom Tokyo Toni for the Fourth of July. While in town, the couple has dinner with Chyna's mom, her dad Eric Sr. and three of her dad's kids. Chyna's parents haven't seen each other in 10 years, so before her mom arrives to dinner, Chyna starts to worry. "I'm really hoping that my mom is really nice at the dinner because she's known for not like giving two f--ks," Chyna explains in the clip above.