Mitchell is a serious, low key kind of guy. In other words, he's the exact opposite of his partner, Cameron. But opposites attract and Mitchell seems to have found the perfect counterbalance for his sometimes uptight, worrying ways. Mitchell has always been a little competitive with his sister Claire and he knows that dad Jay isn't completely comfortable with the fact that he's gay.
Guess that's why it was so hard for him to tell the family that he and Cam adopted a beautiful baby girl. Of course, his family welcomed Lily with open arms knowing that she's lucky to have such a cautious, worrisome, overprotective, completely loving dad.