This is a bit of an odd situation my neice is 9 she lives with my mum full time due to sisters mental health issues, I help alot with her she comes on all family holidays/days out with us and has a bed at my house too, the school and gp have me as a contact so I am able to attend any school meetings and make decisions for her in addition to my mum.
So here is the aibu bit, she has Netflix on her tablet that I pay for, its our ACC we all use each with our own section however some of the things she likes to watch are under not accessible I'm the kids profile she has so I allowed her to go onto mine to watch these things for example my babysitters a vampire. The condition on this is she must always ask before she watches anything on it so we can check its suitable. The problem is I have just discovered my mum has let her watch pretty little liars and the vampire diaries I was really annoyed my mum's excuse was my sister (her mum who has MH issues and lost custody) said they were fine for her. I've said if it's not monitored more closely I will be forced to change my password and my neice will no longer have access to Netflix at all.
My mum thinks it's unfair, which I do agree it is however if I can't trust my mum to monitor it, and check with a responsible adult like me or dp if she's unsure then I don't feel comfortable with giving her access. You can bet if she mentions to a teacher that she's been watching vampires kill ppl and we get called to school my mum will be pointing the finger at me then. So aibu??