I can't deal with my little cousin, it's driving me insane. Please help.
My eleven year old cousin who's three years younger than drives me insane. I have another cousin the same age as her and a close friends little sister who is like another little cousin and also that age, both of them are literally geniuses though and freakishly mature too. Those are the only kids that age I'm used to, while my other cousin is an immature 11 year old brat. I'm used to treating my good cousin and friend as peers, and cannot even begin to tolerate this cousin. She recently moved to the state so I have to deal with her more. Any advice would be great. It's driving me insane.