Connotations of the term "first mother"?

I don't even like the way (2) sounds. I have an oldest child, a youngest son, and a daughter. I don't ign numbers. igning numbers makes something sound replaceable, repeatable, and a part of history. My (adoptive) daddy told me that I'll only ever have one mother, and I should always respect her. I was listening very closely when he said that. Other women may have acted as my mother, but only one woman IS my mother. She's not my first mother. She's my mother.