Maybe he refers to you as 'just' Mandi when his wife is around because he doesn't want to rock the boat and create further jealousies and upset on the part of his wife. Keep the peace? He was happy to have your daughter call him Daddy Chris a year ago and you say you both see all of the kids as being part of your one family unit. Maybe you are making more out of it than was intended. What's in a name? And your name is Mandi. Lol