Dating your best friend's brother?

i like my best friends brother a lot. He is also one of my closest guy friends (I'm a girl). A lot of people say he like's me more then friends including his entire family and they constantly try to hook us up, but I don't know if it's just a joke. I think he has flirted, he teases me everyday to a high extent and when i walk in his house and he has friends over he stares at me even if he is playing video games and if we go see a movie and his sisters sit beside me he will force one of them to move so he can sit next to me.so any advice on this topic and how to make move and do you even think he likes me?