AIBU to refuse my niece joining my son's one-to-one tutor sessions?

[EveryMinuteAndEveryHour]

Since January we have paid for an online A level tutor once a week for an hour for our son.

My niece is doing the same A level and my sister has asked if my niece can sit in on my son’s tutor lessons. I said the tutor is 1:1 so I don’t think that would really be ok with the tutor, thinking that would put her off but it didn’t. She wants my niece to just be in the room listening to get the same lesson as my son gets and thinks this is okay as the tutor wouldn’t know and it wouldn’t change my sons lesson.

I wanted to say no but said I’d ask my son. He has that he doesn’t want her there.

I have told my sister and she is angry. She doesn’t understand why we would say no. She has now offered to pay a small amount towards the tutor each week but it’s not about the money. My son wants the lesson by himself.

My partner thinks my sister is crazy to expect this and the more I think about it so do I. If you have used a tutor, would you actually consider this? My niece is struggling with the subject and my sister says she can’t afford a tutor.

Are we unreasonable to say no?

You’re not even remotely unreasonable. At almost 18, your DS absolutely should have been in the conversation so I entirely understand you speaking to him. It is a bad idea for all of the reasons articulated - it changing your son’s experience, being of minimal benefit to your niece, being unfair to the tutor and potentially having your tutoring sessions cancelled. I also would absolutely not be stumping up for your niece’s tutoring. If she hadn’t been such a CF and had asked you about pricing, contact details etc I might have been inclined to offer part payment of 1 session, or even full payment of 1 session, to see if she liked it as a birthday or early Christmas present but with her current behaviour I wouldn’t actively encourage contact with the tutor at all for worry that she’ll pressure the tutor to drop prices or somehow cut some other deal. Stand your ground OP, this isn’t a you problem

Please do not listen to this rubbish suggestion. I clearly remember way back when I was sitting my final year and my aunt wanted me to tutor my cousin. Exact same situation. He was so far behind, had big gaps and I wasn’t a bloody tutor! I was focused on my own exam!
completely not fair to ask this of someone.

Tell your sister she is really dishonest and teaching her child to lie and you won’t be participating in that. Shame on her

Maybe say yes to neice and then make sure your ds uses headphones for the session. Your sister doesn't need to know he doesn't usually

What a daft and petty asnwer.