It's a great theory, but Dave Filoni confirmed that Ephraim and Mira were absolutely, positively, one-hundred-percent dead. And honestly, I'm okay with that. Losing a parent is hard, it's gut-wrenching, it rips you to your core--but over time, you eventually heal and you learn to cope with the world even if it still feels wrong without them in it. I'm not waxing poetic here; my dad died when I was twelve, and words can't express how hard it was and still is for me. Ezra's journey might be different from mine, but emotionally, his challenges and my own felt really similar. Watching him learn to cope and accept at a time when I was still struggling with it myself a few years later really helped me. I don't think I'm too selfish in saying that I don't want to see Ezra's grief and struggle become devalued and feel cheapened simply for the plot twist of revealing that his parents survived, becauss I know that I can't have been the only person watching that who had been through similar experiences and felt the same. Just because the Ghost crew don't have a drop of familial blood between them doesn't make them any less of a family then the Bridgers were.
I think that whatever the family reunion the title refers to is has something to do with the Ghost crew as a whole, but if I had to take a wild guess, maybe it has something to do with Kanan. Like I said in the Jedi Night thread, they mentioned that they were going to cover his origins and where he was from at one point. Maybe... Maybe they find Caleb Dume's real family, if they're out there still, and tell them about the hero he stepped up and became, even when all he wanted to was run. How he died saving his new family. How his actions helped strike one of the Rebellion's first real blows against the Empire. It's not a family reunion in the typical sense, and now that I've typed it out it doesn't sound like one at all, but that to me would be far more touching and compelling than revealing that the Bridgers survived...