Parenting with someone who isn't your child's biological parent may not be the most straightforward situation. You need your kid to buy in, that person has to buy in, and the other bio parent usually has to buy in. That's a lot of selling for a situation that can go south fast.
I (28M) have a son, Nathan (6M). I'm his sole parent because his mother lost custody battle. His school was aware of this when I removed his mother's details from their system, and his current teacher for grade one has not met my ex.
Due to the nature of the custody battle, his teacher does know about my ex for safety reasons, as she has been barred from coming to the school to get him. She knows that if she ever sees me with a woman, it is not my ex.
His school has parent-teacher meetings twice a year, once before the Christmas break and another at the end of the academic year. I've been dating my girlfriend, Venus (24F), for the past eight months, and she has a fantastic relationship with my son. He likes her and asked if she could come with me to the parent-teacher conference because he wanted her to hear that he was doing well at school.