guess who's coming home today? >> you. >> who? me? are you happy? >> to not have a family dinner for a hundred days is huge. i think those are the most important things to me, sitting down at the table and talking about your day. >> i've been doing it sitting in a hospital bed. >> we were lucky enough that he made it. so that's going to be the most important thing to me. >> all right. on my way. i can't believe it. >> reporter: it is a triumphant day for mark, for his family. and in a way, it's a triumph for his city. because mark is the last of the boston marathon bombing victims to leave the hospital.