Kardashian family is worried that Rob Kardashian might get into drugs after his relation with Blac Chyna, but he claims that he's sober as a mule.
Sources close to the 28-year-old reality star said that he is upset that his family believes he has slipped back into the world of drugs and is insisting that he's clean, reports TMZ.com.
Insiders also revealed that Rob claims that he has improved the quality of his life by living with Chyna as he is finally eating to lose weight and he works out everyday because she has a gym in her house.