If it feels wrong,then maybe it is wrong for you to date the brother... Can it cause any hurt between the brothers? Need to try to find that out, in case things don't work out or in case things do work out...if you get my drift... Best wishes
I think it is wrong. It causes a lot of drama within the family. I know someone who had done it to 2 brothers and now they never talk anymore. Just think of it as if you dated a guy and he left you and wanted to date your sister or something.