Asking Eric: Do we send our daughter a Mother's Day card, even if she a stepmom?

Asking Eric: Do we send our daughter a Mother's Day card, even if she a stepmom?

Dear Eric: My daughter married a man who had two young children in a 50/50 custody relationship between him and his ex, their mother. My daughter was “in the role” of mother for half of their lives, but is identified by her first name only, never as “mom”. My dilemma is: Do I send a Happy Mother’s Day card to my daughter, or would that be out of line?