I really need advice...preferably by girls!(sorry guys)?

So... i have a lot of cousins on my dads side but 2 of them are compleate butches! And they always leave me out of everything and the guys always hang together and i dont want to hang out with them and Megan and Maddie and like younger than me and they are really immature. So what do i do what i HAVE to spend time with them like at thanksgiving?