Rob Kardashian, the only son in the brood, is on the headlines after his dating relationship with Blac Chyna was publicized on Jan. 25. At first, his sisters and mom did not take the news seriously and just considered them as baseless rumors but when intimate photos showed up in social media, the Kardashians freaked out.

Apparently, no one in the family is happy with Rob's relationship and this is quite understandable. Chyna is the ex-fiance of Kylie Jenner's boyfriend Tyga and they have a 3-year-old son. In addition, the model is Amber Rose's BFF -- the bitter enemy of the #KUWTK clan.

For Kylie, she thinks that Rob has a "hidden agenda" with his stunt of dating Chyna while mom Kris Jenner expressed her disgust with what his son has been up to lately, by calling the model as "troublemaker."

Then again, it seems that whatever his family says, Rob doesn't care and just continues on with his newfound life with Chyna. It also appears that the only son in the family is trying to infuriate his sisters further by declaring on Instagram that he would like to change Blac's surname -- from Chyna to Kardashian -- meaning, he is planning to marry her, perhaps soon!

According to Hollywood Life, it is possible that Rob is making this move to anger his sisters, especially Kim, even more. "Rob's going for the jugular," a source allegedly told the magazine.

"While he loves Blac Chyna, he wants to stick it to his sisters in the worst way possible. That's why he wants Blac to change her name to Blac Kardashian. Rob thinks it's hilarious."

Now, since the family is really not sure if Rob is only cracking a joke or not, they are having nightmares due to fears that he is actually serious in eloping with Chyna. And it is much worse if they would then have a child together soon!

Another source said, "Rob's sisters are convinced he is joking, but he is making them upset by sending texts to them saying he wants to marry Blac Chyna and that it will happen soon."

"Especially since Valentine's Day is right around the corner. But as much as they think he is kidding, they are also scared that he may be serious and elope in Vegas," the source added.

While the Kardashians are worrying too much, one person is happy for Rob and Blac, and it is Amber Rose. She even wants the couple to have a baby now. Rose could be saying this as Blac's bestie, but somewhow, there is this assumption that she wants it to happen for the #KUWTK stars to go crazy.

"Amber thinks it would be funny and fitting if Rob got Blac Chyna pregnant. She thinks all the drama that it would bring the Kardashian family would be worth it. She's been telling Blac to get the job done," an insider revealed to HL.