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The original was posted on /r/AmItheAsshole by /u/Separate-Parsley-303 on 2023-07-30 12:21:30.

I (32F) have a niece, Lara(18). When I’m travelling, I usually ask her to stay in my house and take care of my cats. She’s sharing a room with her sister(15) at home, so she’s always happy when she can have some privacy at my place. I always leave her groceries and some cash for emergencies, and she can do anything as long as the house is clean when I get home. The only ground rule is that she can’t invite people over without letting me know, and before any of her friends come over, she introduces them to me. Nothing formal, just to see who I’m letting into my house. We’ve never had a problem with that until now.

I’m on vacation and I got a call from my neighbour that he saw a stranger in my garden. I checked the security footage, and it turns out Lara’s bf(25), Dan, who I’ve never met, is there for at least 3 days. I called Lara to ask how she’s doing. I also asked if she’s invited anyone over. She said no without hesitation. I told her I saw Dan on the camera. Radio silence, then she ended the call. I called again, straight to voice mail. An hour later she called me back, said that Dan just quickly visited her, but it’s no big deal, because he’s a good guy, so just enjoy my vacation, and ended the call again.

Now, she was supposed to go on vacation to my lake house for a week in August. After her call, I wrote a message that since she didn’t stick to the rules, lied about it multiple times, and hasn’t even apologised, she can’t go to the lake house, because I don’t trust her to go there unsupervised. She called again, screaming, crying, calling me a heartless, ungrateful b***h, telling me I ruined her summer just because she didn’t stick to my stupid, petty rules and she’ll never do me a favour ever again.

Ever since then, the whole family is bombarding me with calls and texts about how could I treat Lara like this, and why do I have a lake house if I can’t even let my niece use it. I tried to explain that everyone’s allowed to go there, as long as I know I can trust them, but Lara lost that now because she lied to me and she still thinks she’s done nothing wrong. If she at least explained the situation and apologised when I first asked, I wouldn’t have cancelled her vacation. My mom thinks I’m right, and it’s about time that Lara learns her actions have consequences, but most of the family still thinks I’m an AH. So, AITA here?