On Jan. 27, a seemingly-smitten Rob Kardashian posted a picture of Blac Chyna, captioning the photo with an emoji of a key, implying that she's the key to his happiness. However, at the same, it's his relationship with Chyna that may prohibit his house key from working in his own home.

The reclusive member of the famous reality TV family has been living at Khloe Kardashian's home for several years, but his new romance with Chyna is causing a severe rift in his family, one that will see him shacking up elsewhere unless he soon puts the kibosh on the budding relationship.

"He won't be welcomed back to Khloe's now," a source told People magazine.

Right now, Rob doesn't seem to care -- in fact, he seems rather taken, as evidenced by his close up picture of his new boo.

According to TMZ, Rob has essentially been living at Chyna's for nearly a week, much to the chagrin of his family.

"They are dating and have been for a few weeks. Who knows how serious it is," the source tells People. "Rob has been lonely for so long, so of course it's great for him to spend time with someone other than his sisters. Rob has also found an escape from his family nagging him about his heath. He has ignored their attempts to contact him."

TMZ said Chyna has a home gym and she's encouraging Rob to use the equipment to get healthy, especially considering his recent diabetes diagnosis.

"Rob likes her and seems to think it's mutual. It's just hard to take things seriously since obviously both share a lot of anger toward the [Kardashian-Jenner] girls," says the source. "They have both had a lot of drama with Kim. Rob really seems to get a kick out of all the drama that he is causing."

A day after the news broke, Rob even posted an Instagram meme of Chyna that many in the media saw as a direct shot at his sisters.

The whole thing sparked on Jan. 25 after Chyna posted an Instagram of her and a man who appeared to be Rob. The following day, Khloe took to Twitter, saying, "You can do anything. But never go against the family." She came out and said it was not directed at Rob or his romance, but she later implied that it was. Furthermore, she used the same terminology in the early morning hours of Jan. 27 in posting a snap of her and her sisters, along with friend Larsa Pippen.

At one point, Kim Kardashian was close with Chyna, but their relationship frayed after Kylie Jenner began dating Tyga, who shares a 3-year-old with Chyna. Chyna is also BFF with Amber Rose, a longtime nemesis of the Kardashian-Jenner family and an ex-girlfriend of Kanye West, Kim's husband.

Kylie is also said to be beside herself with the romance. The teen even reportedly posted a photo of a devil on social media, saying "this is @robkardashian lol." She quickly deleted it.

"She feels super betrayed," People's source said, "and can't understand why someone in her own family would stab her in the back like that."

Home is not where the heart is for Rob right now.