Okay, but seriously now there's my very long running multi-generational game (apologies to those who have heard this so many times). Two siblings in Generation 2, one raised 12 kids spaced out pretty well, not all young at the same time. That really wasn't difficult and both parents loved every minute of it. # 12 happened to be adopted and will still be a toddler or a very young child when they both age up to elder, if I played an even longer lifespan they would have probably have just kept going. And there are always going to be tons of grandkids around for them to spoil I mean help raise, soon to be some great grandkids as well.
The other sibling has over 30 kids. Note the wish says have x number of kids, not raise them. But he is not family oriented and not drawing wishes like that, 26 of them were "illegitimate." Of the remaining four, two of them were science center clones, so they arrived as children already, and one was raised by the other parent until they were a teen so there weren't all that many diapers to deal with over the years. This sibling has a genetic connection to the my game's founder, the first TS3 sim I ever made, and most of his offspring are scattered about many different NRaas Traveler mod connected worlds so I get to see that sim's genetics all over the place whichever world I am playing in. :)
I don't know if merely fathering these children would have satisfied the wish shown or if them being in all different worlds would have goofed up the count, but he was never going to draw wishes like that anyway. He's not a bad father, but of course he can't keep up with all of those kids in foreign worlds when he is at home. But he is very...let's say affectionate generally, if not more than bit Commitment Issues challenged with 23 Romantic Interests we probably would not ever want to see in the same place/world at the same time. ;)