That's an easy one: Well, Lupin and Tonks would continue and have there pack expanded beyond Teddy, probably another Andromeda or some other family name. One of my fanfics had it where they had a daughter named Isadora. I think they would continue being Aurors and maybe Lupin starts a Reformation for werewolves and their children would follow in their footsteps.

I think Harry would more likely be a frequent guest at their house and keep a close watch on his godson and be there like Sirius never was able to. I think this family would change the world and fight for equal rights for all species.

It's a shame that this can't be. I see J.K.'s reasoning behind it, but it's still a very sad story that these two had to die, but it's a nice reflection of the previous war.

I think they would have been proud grandparents and would expand even more on their family tree of multi-colored werewolves!