Well, if someone experiences any of this I hope they'll chime in.
There is one thing I'd change if I could - the age of the potential mates. It seems they're all within one year of the main family member. But IRL it doesn't always work that way. I, for instance, admit I'm shallow when it comes to age. I'm ONLY attracted to men OLDER then me. I don't get along with younger guys/guys my own age, and would rather be with a man in his 60s then a boy in his 30s. When I play VV I always mate the older men to the younger women.
And of course there's women who prefer younger guys - though why I don't know. I know why I'm attracted to older men - my personality meshes better with their's what with my tastes in music and a lot of my old fashion beliefs and ways. Plus women do mature faster mentally then guys. Still you have marriages like Demi Moore and Ashton Kutcher. (And on the other end Harrison Ford and that stick figure he married.) And they're happy marriages.
So there defiantly should be a bigger variance in ages for mates. There's absolutely no reason a 40 year old man can't propose to a 28 year old woman in the game.