Kris and Robert Kardashian found themselves growing apart and decided to divorce in 1989 after Robert filed for the divorce. They both remarried Kris to Bruce Jenner and Robert also remarried 6 months prior to passing fro Esophogeal Cancer.
Kris and Robert remained good friends even after the divorce. Robert and Bruce were also good friends. Before Robert died of Cancer, Bruce made Robert a promise, that he would care for Kris and the kids. Bruce has acted as the Rob and the girl's father and is well respected by the kids.
The divorce between Kris and Robert Kardashian was very amicable and actually the families were very close.
I hope this is helpful. Joan
Regardless of whether it "seems" right to you or not, it is the truth. Having children is only a small part of a successful marriage. Their basis for their marriage was their closeness to each other, not to whether they had children or not. It was their marital closeness that deteriorated, not their relationship with their children.