It might also be cool to make it so you can improve relations with family members by spending time with them in like keep, adding a specific option to bond with family members so you can improve relations with them so you don't maintain a 0 relationship with them. The specific option would also make it so you can choose when you want to potentially have a baby with your spouse.
Maybe also adding a bonding mechanic when you fight alongside family members and friends in the game, sort of like an appreciation towards each other's skills.