How to deal with a crush that won't talk to you?

There is this guy at my church and we used to talk because his sister watched me and my brother during the day in the summer because both my parents had to work and his sister who is in college at the moment watched us. Well we talked then but now evertime I look at him (which is alot) i always see him with his friends I need help on what to talk to him about if he ever gets alone and how to flirt with him we're both in the same grade and he loves sports but i know nothing about sports we're in 7th grade so yeah help meHow to deal with a crush that won't talk to you?
seriously. talk to him. If you don't, then nothing will happen. And if nothing happens, you'll eventually get bored of nothing happening and get over him. Same rule applies to him.