Is it consider cheating if you let someone copy your homework?

technically your guilty of association and allowing them to cheat. You are both At Fault. and I wouldn't suggest you let them copy your homework at all.... lets say if they passed thiers in and then you did, your teacher would look at either of you and know one of you cheated, and you could be the one the teacher thinks cheated... or the other. maybe just sit down and help them with the questions, it works out better.