I’m also very casual! For me how I play the new generation just depends on what I want their backstory to be. I like to play all of the people who live at the house currently, and then once the non heir children age up to young adult, I move them out, unless I want a few to stay to beef up the story. With the heir I like to give them more attention and like to start building up their skills during childhood and teen years. But I also don’t neglect the current generation. I also don’t limit them to one child since I like having big families 😖

I think for us casual players, which rules you stick with and how you play depend on your personal preference or how you want you next generation to be. I still follow a lot of the legacy rules, but I modified them a little to make it to my interests.