I (33M) live with my husband (31M) and our 7-month-old daughter. We adopted her last year after a long, difficult process, and she’s the center of our world now.

Before becoming parents, we had a rescue dog named Luna. She was a calm, sweet pit-lab mix who’d been through a lot before we adopted her. She was my emotional support during some really dark years, and we loved her deeply.

A few months ago, my younger brother (26M) came to stay with us while looking for work. When my husband and I had to fly out for a weekend wedding, we asked him to house-sit and take care of Luna. I left a detailed list of instructions: no off-leash walks, no loud music, no weed inside (Luna had noise and smell sensitivities). He nodded along and said he had it.

We came back Sunday night and Luna was gone.

Turns out he took her to the park, let her off the leash while blasting music and high as hell. She bolted. Two days later, we got the call, she’d been hit by a car. Killed instantly.

I confronted my brother and he barely reacted. Just said something like, “I didn’t think she’d run off, my bad.” No real remorse.

Since then, he’s been trying to come visit and meet our baby. But I can’t do it. I told him I don’t trust him, and if he couldn’t respect basic instructions about Luna, there’s no way I’m putting him near our daughter. My mom says I’m overreacting, holding a grudge, and “it’s just a dog.” But Luna wasn’t just a dog. She was family. A friend told me I was doing the right thing and suggested I read this because it would help me. But it feels a bit too drastic to me...

So yeah... AITAH for keeping my brother away from my kid after he got my dog killed?