There is a long tradition of wealthy people not actually raising their own kids. They have kids to carry on their legacy, not for the joy of having them.

They have round the clock nannies and tutors so they never have to deal with the kids. Sometimes they might see the kids at dinner or on weekends, but really it's the nannies that raise the child.

I'm not saying Marc is that kind of person, but he might be. Or maybe his spouse does most of the child rearing.

In Marc's defense, the schedule presented here is pretty family compatible. He has lots of free time in the evenings.