Do not do this! Really. Don't. My mother taught at my school and it was not a happy time for either of us. Or indeed for my classmates. It destroyed my relationship with my mother to the extent that my father agreed to send me to boarding school at my request. It took many years for me to forgive my mother.
I had two other children in my class with teachers as parents, and it wasn't much fun for them either.
For me it was about my mother invading my territory. It was my school, and then she came and worked there (at the instigation of my headmistress). It was a small school, and she had to teach me. Everyone knew both of us. She knew everything about my school life, all the little incidents that no one would have brought up with a parent, but she found out because she was there. I got crap from kids who didn't like her, and then had little support from friends when I didn't get on with my mum, because they said she was so nice, and so easy to talk to. Well not for me!
I was very angry with my mother, and I expressed this by refusing to call her "Mrs x", and disrupting her lessons whenever I could. A pity, because she was actually a very good teacher. But then her friends in the staff room called me by my family nickname, which I absolutely hated (I didn't like them and felt they were trading on their privileged relationship). I really don't think it is either fair or effective to pretend that you are not in fact related.
Also because she was very professional it meant that she never talked about school, so we had nothing to talk about after school (no how was your day type stuff).
Of the two other kids with parent teachers, one was always known as "little x(teacher's name)" which she hated (she had a nervous breakdown, probably not related), and the other went completely off the rails.
Maybe in a very big school there would be less problems (mine was three form entry). But I think it is a very very unfair thing to do.