Exactly how OLD is your brother? To be honest, I'd get rid of his mice too. He doesn't take care of them, and now the male could be getting yours pregnant. I'd suggest that he gets a pet rock. OBVIOUSLY, he's not responsible enough to have any LIVING pets. Letting mice get to the point of cannibalism is animal neglect. It doesn't matter if they're only mice, he could be charged for that. Tell him to smarten the FUDGE (I dunno if you can swear on these boards) up! He's older than YOU, and yet, YOU're taking care of his pets? If he's not willing to put up the time and TAKE CARE OF THEM, then he shouldn't HAVE them. Animal cruelty does NOT sit well with me. Chinchillas are NOT good pets for kids. They also take quite a bit of work. A 5 year old having one as a pet is just...stupid. If I was to suggest ANY pet, it'd be a cat. You feed it and change the litterbox. It seems the safest idea to suggest to him. As for your loose mice, I'd suggest to keep doing what you are. Someone else mentioend peanut butter. My mice LOVE peanut butter. I'd try to declutter the floor...take ANYTHING you can off of it. Also, make sure that they can drink water. The problem with a bin is that ou can't just leave it open for them to crawl back into (I've had one of my escaped mice do that) At one point, all 6 of my mice had escaped and I caught them all by hand within 2 days, but that was out of pure luck. Also, where are you keeping your mice? I'd put them someowhere where your brother HOPEFULLy won't touch them or knock over the lid. I'd also find a better way fo securing the top, so this doesn't happen again. Seriously, give your brother a good smack upside the head. If you do catch his mice/mouse again, give them away. Just say thaey got loose again. Also, I COULD be wrong, but if he has gotten your mice pregnant, his being wild shouldn't affect the babies temperment, though it could seriously affect their health. He isn't afterall a wild breed of mouse, is he? As for giving the mice to a petstore, I don't see ANY harm in that. You couldn't take care of the mice, and you did the best you could. If your females are pregnant though, I'd suggest trying to find homes for them. You are NOT ranting, you have EVERY reason to be mad at him. I have to say, you seem to be pretty responsible, if you're taking care of his pets as well as yours. i'm only wondering if his petcare reflects on his parenting. He can't even be responsible enough to take care of MICE and yet he has a daughter? I think I should stop this post, 'cause I'm getting really mean.