Won’t Let My Brother and His Kids Move In With Me. AITAH?

Who deserves our help? When is it okay to ask for it, and what is the right way to do it? And when do such requests call for the setting up of healthy boundaries?
Based on r/AITAH, featuring:
AITAH for saying I wouldn’t allow my brother and his kids live with me when I buy my house
AITAH for not helping my ex wife who cheated on me?

[@lancerevell5979]

First story.... Perfect example of, "Not my zoo, not my monkeys!"
Family flying monkeys are being mighty free with OP's property! They need to figure something out, and not involving OP. 😮

[@rJefff]

My thoughts exactly. OP shouldn’t feel responsible to solve their problems