My FH son calls me Miss. Myfirst name. In my FH's family people refer to their mothers as mumsie/ mum. Yesterday my future stepson told me I am now Miss. Mumsie since I am not his biological mom he added the Miss. He calls his bioligcal mommy. He heard his cousins on his father's side calling their mother "mumsie". We are not getting married until april knowing my FSS ( future stepson) he will change my name 10 more times as he is five. I thought it was so funny Miss. Mumsie. I tried to explain that I will be a Mrs. it went over his head. I just love children they crack me up.So once you are married what will your future step child call you or what does he/she call you know.