If the villager are going to be sorted by their last names .. (for example the dad's name is Jacob Martinez and the moms name was rosa Vasquez.. then the kid is Sarah Marines vasquez).. maybe when you are going to get two villagers together since it has already saved their names .. maybe say they cant villagers are brother and sister or dad and daughter(just like how noe it says the villager is too young or they are the same gender)

and maybe if there is going to be marriages say oh villager is already married ..