Do your kids call you "mom" / "dad"?

I have 3 adopted kids. One calls me mom, she was 4 when she came and didn't remember her bio mom. Her bio sister calls me by my first name, she lived with bio mom til she was 5. Orginially we had her call me mom, but we told her after a year or two, she could call me by first name. Third child came after her bio mom died and first adopted family disrupted. I have had her call me my first name - having another mom is pretty scary after you have lost 2 moms