
Maybe you could have Hoshi's family become really anti-war and thus, anti-Starfleet, so that causes grief. Or Malcolm's mom passes away (either in an accident or just natural causes) so now he has to interact with his dad again and discovers a hollow shell of a man or something. Or we find out that Hoshi's dad is a strict, strict guy who refuses to entertain the notion of his daughter marrying someone who isn't of Japanese origin ... so Reed has to either kill the guy and make it look like an accident or he has to convince the guy otherwise. Or the war reaches Earth and a Romulan nuke takes out the home of one of the two. How does that person react to the total massacre of their family? Do they go all dark and grim like Trip was trying to do, or do they curl up in a little ball?