How do we decide what people should call one another in our newly blended family? It's a second marriage for my husband and me, and each of us had a three-year-old child when we married. Those kids are now six and seven years old. Recently, my step-daughter started calling me "Mom." When my husband's ex-wife heard about this she became extremely upset. We explained that we were as shocked as she was, especially since this little girl had been struggling with the new family arrangement. My husband's ex wants her daughter to call me by my first name only, but I'm not sure I'm comfortable with this. What should we do?