I would like to chalk it up to nannies, but, all of them have always said how accessible he has been to them, with many good examples, and don't forget the mother of the oldest three is Ivana and she was portrayed as hands on for the most part too when they were young. I'm sure they had staff, but, they were there too (I hate Trump so no support for him here politically or otherwise) and Marla Maples said Tiffany always had access to her father, but, she was raised alone and I'm pretty sure there were no nannies in that upbringing. And interestingly all those children seem very smart, based on their grades.