I want to call my brother's kid a retard.
Why would you call a kid a name like that?
My little nephew is a retard and he ticks me off.
Labelling a child negatively shatters their self-worth and motivates them to be like that. It is an inappropriate way to talk to a child and devastates their psychological needs.
Whatever I talked to him nicely and he just doesn't listen. He's a retard.
I really think you should stop using that word in a negative light. How would your brother feel hearing you say this?