Federer had/has a gaggle of nannies taking care of his kids. I remember reading that each kid had/has their own nanny. He is hardly like a regular working person in any regard, kids included. These people are not doing all of this child-rearing. They pay other people to do it for them.
As for if Rafa can win any more slams now that he is a father, I am not so sure about that. Rafa tends to be the anxious worrier type, so I can see him struggling to concentrate with a kid around. He struggled mightily in NY due to his wife having pregnancy complications. He was clearly preoccupied with family stuff there and it showed. Time will tell if he can do it, but I would not be surprised if he doesn't adapt very well.
Sure he’s obviously richer than Croesus himself and has every possible luxury possible, but it’s not like he is a “father in name only” is my point. He still brought the kids everywhere he went, and I don’t care if everything is being cooked and cleaned for him, managing two sets of twins just in day to day life isn’t easy, lol… by all accounts he is not an absent father, especially for athlete standards, and it’s one of the things I admire most about him.
I think I agree on Rafa, especially as he will be feeling the pressure of retirement as he ages… I mean, his body has gone through so much, a young child at home, I fear that his next “serious” injury may be his last. Zoom out a bit, he’d be 37-38 and now has a young kid he wants to play with - maybe looking at the mountain of rehab and practice doesn’t seem worth it anymore.
On the other hand, he has said that he plans to continue his career as long as possible and if anyone can fight through it’s him.