Most of the time I play small families, on low free will. But once, years ago, I decided to let the family oriented couple I was playing have a child every time they both wished for one. They had 13 altogether, including on set of twins. I moved each of them out as soon as they aged up to young adult, except for one at a time who stayed to help care for the babies and toddlers. I was still playing on low free will, but it actually worked out, and I played the household until both parents died of old age, then moved the one young adult daughter who still lived there to a new town, along with her three remaining siblings who were still teen or children. I never did play them in the new town, because I started a new game with the twin sisters instead, and never got back to the others.