Ethan Goodspeed/Rom

Ok, this maybe a really stupid question, esp. for those of you who know me around here, but bare with me, I am just getting over the Swine Flu (H1N1), and my brain is a li'l mushy still. OK, Here it goes: Have we actually ever been told (or to use a better term, "had confirmed") than Ethan, the son of Horace and Amy, is in actuality Ethan Rom? Just wondering. Are we just going off Juliet's reaction, or have Team Darlton said something about it and I just cant put my fingers on it right now? Was it confirmed on a clip show? A little help here please.....