Kardashians suspicious over Rob, Blac Chyna's relation

It official.Rob Kardashian and Blac Chyna are dating, but the family is getting suspicious!

The Kardashians feel that 27-year-old Chyna, former-fiance of Kylie Jenner's on-and-off boyfriend Tyga, is "preying" on Rob "during a week time," reports E! Online.

The family is also concerned that the 27-year-old model, who has a 3-year-old son with the 26-year-old rapper named King Cairo, is only using Rob to get back at Kylie.

Reportedly, Kylie doesn't want to further her long-rumored feud with Blac Chyna, so she's doing her best to avoid it altogether.