AceShowbiz -

Rob Kardashian is "sad and sick" over his absence from his family getaway in Costa Rica. The "Rob & Chyna" star is one of the family members who skipped the Kardashians-Jenners' annual vacation, and he feels estranged from them.

"Rob [Kardashian] has been sad and sick lately over the growing divide between him and the rest of his family," an insider reveals to HollywoodLife.com, "The sisters continue to go on family trips and film 'Keeping Up with the Kardashians' without him. Even though Kris [Jenner] always reaches out to Rob and invites him on the family vacations, Rob simply does not feel comfortable or welcomed by the rest of the family."

This rift between Rob and the rest of the Kardashian-Jenner clan has been going on ever since he started dating Blac Chyna. "Rob feels like his sisters are constantly judging and trying to direct his life. The whole situation has Rob feeling isolated and apart from the rest of his very tight-knit family," adds the insider.

Rumor has it, Rob and Blac are banned from filming "KUWTK". A source previously revealed, "Missing from the new scenes of 'KUWTK' are Rob & Chyna. The family is still very divided since Dream's birth and the awkward holidays. Kris Jenner and the sisters have mixed feelings towards Rob's relationship with his baby mama and as a result, Chyna is largely being shunned by the family. Rob has been by Chyna's side, even though Kourtney, Kylie and the rest of the girls have been avoiding them."