This has to be a shit post, but incase it isn't: Of course YWBTA! So there is a little kitten, a BABY, that wants some love and attention but because you don't like you want to let it out where it will most likely die?! Wtf is wrong with you?

Is your brother neglecting this kitten in some way? Is he not feeding the kitten properly, ignoring it, not changing the litter, not playing with the kitten etc? If so, your response is not to just let the kitten out and hope it never returns. You need to sit down and talk with your brother about how he isn't looking after the kitten properly, and it should be rehomed where it will get the love and treatment it deserves.

If however your brother is treating the kitten right and loves it, it is not your place to say the kitten needs to go. If you share a house with your brother, then it's not the kitten that needs to leave but you. What you are considering doing to the poor little baby cat is animal abuse. And on another note, what is wrong with your brother getting a kitten. I mean, making him more of a man by potentially killing his cat? Really? It's a pet, whether it barks, meows, tweets glubs or hisses if it makes your brother happy and give him comfort then that's all that matters. Don't be a selfish twit.