I am a casual player and I have about 5 saved games each different so I can change style of play. Which is why I am only on generateration 3 or 4 in most of them lol
One is my sort of legacy. I started with two coupled and had their children inter marry and play rotational from there. I tend to have too many children in the families and the rotation gets overwhelming. I have a hard time making them unplayed though (as MCC will do the weirdest things with those families).
One is my gingers take over sim world. My founder was to have as many children as he can with all the redheads in the sims world. He has so far had about 30. Some of his kids have now had children, again trying to have them marrying redheads. Again rotational and hard to let go when it gets to be too many. In this case I only had him raise 7 and one girlfriend had 3 so those are the only ones I am playing.
I have an alien save (current) with MCC on alien invasion. I am trying to play only a few but wholly crow the alien babies just keep coming and I have a hard time sending back to home world lol.
I also have a Curious brothers save (They were always my favorite in Sims 2) Just two families with this one but only on 2nd generation, haven't played this one in a year or more
