Now, technically, the “First born must be the heir” rule choice won, but I don’t like that it only won by a small margin. I have also done more thoughts on the matter and have come up with the final rules for The Sims 4 Legacy Challenge in how heirs are going to be handled and chosen.
As part of the creation of your founder, you must also decide, before you even start playing your new Legacy Family, what your succession law is. This decision must be made at the very start of the challenge, and may not be changed at all for the duration of your family’s 10 generations. The law has three different components, and you must make a selection for all three categories. That said, the components can be mixed and matched however you like.