3yr old daughters bio dad having his gf of 1yr call her “mom”

Please don’t comment being rude. I’m already sad. My 3 year olds biological dad only sees her on Sundays (due to his schedule he’s too busy to be a dad) and his girlfriend of a year has told my daughter to call her mom....I’m bothered by this. I took care of her from day 1 all by myself until I left him when she was 4 months because he was abusive, now I’m married to an amazing man and we have a 2 month old. Not sure if it’s just left over hormones from having a baby? I just cried when my 3 year old came home saying her bio dads girlfriend was her mom. And so I asked him if they told her to call her mom and he said she calls every woman mom, and I know that’s not true. She’ll sometimes call her aunt, mom but then corrects herself. Part of me says let it go, the other part says, they only want to see her 4 times a month, for a couple of hours, they fill her up with sugary juice and candy and send her back a mess and in a pull-up saying she had an accident when she doesn’t have pee accidents in her underwear here, so why would they want to call themselves parents when they just act like babysitters once a week for 4 hours? I even offered alternative names; bonus mom & step mom. I just am sad that she wants to take credit to being her mom when she just sees her once a week.If they get married and they take more responsibility with her I’d be open to her calling her mom but not when they don’t have the time for her. His girlfriend decided when we met she didn’t like me, I’ve tried to talk to her and she ignores me and won’t even say hi back to me when I say hello via /r/Parenting https://ift.tt/33OUWY1