make a giga-chad and impregnate as many women as you can. Or play as a total slut and pop out as many kids as you possibly can.
I honestly don't know the mechanics of The Sims these days, the last one I played was Sims 2. If the parents die and only the kid is left, can you stay in the house or do you get taken away? You could also do a hobo run if that's possible, buy a lot but everything has to be outside. Could you do a run where you keep one sim locked away in a basement?