Kris Jenner has to ''let go'' of Rob Kardashian.

The 60-year-old momager has realized how in love her 29-year-old son and his fiancée Blac Chyna - who are expecting their first child together - are, and has admitted she needs to give her child space to make his own decisions now.

In a preview of the 'Keeping Up With the Kardashians' episode, which is set to air on Sunday (03.07.16), and has subsequently been reported on E! News, the mother of seven - who also has daughters Kourtney, 37, Kim Kardashian West, 35, Khloé, 32, Kendall, 20, and Kylie, 18, - told Khloé: ''It feels so good to have had the conversation with Rob and Chyna. ''Just being with them and hearing what they had to say and seeing how in love they are is amazing.

''I said 'Look, I just want Rob to be joyful, happy and productive'. And he goes, 'Mom, I'm really happy. This is what I want.'''

''He's a grown man and he needs to make his own decisions, and I need to let go a little bit.''

And Kris is impressed by her youngest child Kylie's maturity by accepting her half-brother's romance with Blac - who has three-year-old son King Cairo with her current rapper boyfriend Tyga.

Kris explained: ''It makes me so happy that Kylie was able to be so mature and sit down with her brother and Chyna and really get some of the past issues talked about.

''The next step, I think is really for my other kids to follow in Kylie's footsteps.''

However, the Kardashian/ Jenner gang have now shifted their disapproval onto the 'Rack City' hitmaker, who has rekindled his romance with the teen entrepreneur after splitting in May this year.

Speaking previously about the Kylie Cosmetics founder's on-off relationship with the 26-year-old musician, a source said: ''He's really not good for Kylie. The family doesn't want him around.''

''Her family isn't too upset about Kylie and Tyga being back together. They don't think it's permanent.''