Rob Kardashian wants ''dual custody'' of his daughter Dream.

The 'Keeping Up With the Kardashians' star wants to reach an agreement with on/off fiancée Blac Chyna over the care of their three-month-old little girl, and his mother Kris Jenner has vowed to be by his side throughout their negotiations.

A source told People: ''Rob wants dual custody of their child and Blac Chyna is giving pushback.

''They are still figuring things out but she will certainly do whatever it takes to have Dream be with her for the majority of the time.

''Kris [Jenner] is backing Rob up 100 percent and won't let Chyna get away with anything that's less than fair.''

And Kris, 61, isn't the only member of the family backing the 29-year-old reality star.

The source added: ''The entire Kardashian family is there for Rob as well and supports him wholeheartedly.

''They are prepared to protect him in whatever way they need to.''

But another insider doesn't think Chyna will agree to Rob's desire for shared custody.

The source said: ''I expect things to get ugly. Chyna wants full custody with Rob only getting visitations.''

It was recently revealed Rob currently cares for Dream twice a week.

A source said: ''They are amicable and get along when it comes to Dream. There's no set day or times that Rob will take [care of] Dream. They haven't fully figured it out yet, but they are working on it.

''So far co-parenting has been working fine. At this point, Rob sees Dream at least one or two times a week, but again there's not a schedule set in stone yet.''

And despite the demise of his relationship, the 'Rob & Chyna' star is feeling very ''positive''.

An insider said: ''Rob had been staying at Kris' house with the baby while Chyna was out of town and Kris was helping him with the baby. He's in a really positive mood again.

''Everything was moving so fast with the relationship, the baby, the engagement and the show that this break has been really good for both of them.

''Now that they've had space, we'll see if they end up getting back together, but for now, they are still happily separated. They are both much happier and in a better place right now.''