May/December relationships, especially with remarriage if the wife died first. How about a bigger age margin in marriage proposals? Right now they always seem around the same age. Which means the older your adoptee, the less time they have to have a baby or six. As a 32 year old who's attracted to older men, I'm very much a fan of May/December relationships and see no reason that if you have a male adoptee of say 27, the women proposing can't be 19 or 20. While if you have a female adoptee of 25 the men proposing could be as old as 40. I mean, because of my old fashion beliefs and taste in music, I personally would have no problem with a guy in mid-60s asking me out. So why do all the couples in this game always have to be within two or three years of each other?
Seeing the couples argue over more then just babies. (Possible divorce/remarriage issues too.)
Picking up more then just one weed/sock/wrapper at a time.
Mops/brooms for faster spot cleaning time.
Interactions with the pets - feeding, playing, bathing, etc.