Blac Chyna Says Kylie's Ready for Adventures in Babysitting MY Kids!

Blac Chyna's old beef with Kardashian-Jenner sisters might get reheated -- depending on how Kylie Jenner receives a comment BC made about babysitting duties in the fam.

Chyna and Rob Kardashian did a Facebook Live Q & A on Wednesday afternoon to promote their upcoming reality show, and naturally someone asked which sister they'd trust to watch their newborn.

Kylie got the nod, but not only for the infant. Check out how Chyna slipped 3-year-old King in as a babysitting package deal. Watch, it kinda sounds like she's telling KJ ... if you wanna keep messing with Tyga then you're gonna have to watch his kid too.