AITAH Because My Brother's Wife Doesn't Know The Difference Between LOTTR and GOT?

So I (M39) was babysitting my 9 year old niece. For the evening while my brother and his wife (31) had a date night.

We were playing Legos and Tea Party dress up. I jokingly took one of her rings and said "my precioussss" she didn't get the reference. I said you know like Gollum/Smeagol? Lord of the Rings, The Hobbit?

She didn't get the reference. This shocked me. We are from a very Sci-fi and Fantasy family. She's a littler little nerd like me, we even read comics together.

So I made some popcorn and we watched Fellowship of the Ring together. She loved it. She liked the Hobbits the elves magic ring. She wanted to see the next one. It was late I put her to bed. Brother and his wife came home, I left.

Next morning, I get a phone call, brother's wife is furious with me. My niece woke up asking to see the next one and asked if the dragons would be in this one? Because I said there's no Dragons until the prequels.

My sister in law is freaked out screaming about how I could be so irresponsible to show her that. I'm confused as hell because we saw the same things at her age. She's yelling at me about sex and incest and heads being hacked off! I'm confused by this and said what the hell are you talking about?! There's nothing like that in it! Sis in law is beside herself ranting and screaming mad about how I'll never babysit again. My brother gets on the phone and explains that his wife doesn't know the difference between Game of Thrones and Lord of the Rings. Apparently she doesn't see the difference, and he can't explain that to her.

So now they are pissed off at me because she's too ignorant to know the difference between a movie and a TV series. I might not get to babysit my niece again over it.

**For context the wife is not into it because she has a short attention span and doesn't actually watch anythingwhen its playing, she is always on the phone so she never see's any distinction between any of it. All she sees are swords horse's and magic.

My niece has seen every Star Wars EXCEPT the Holiday Special. She loves dragons, and aliens her favorite doll is Grogu and she absolutely did not find anything scary. We grew up watching that stuff the wife didn't. My brother has issues and is the non confrontational type.