Do you think they will let me play volleyball with them 🙂?

Yes, you look like the kind of person who makes a good teammate at volleyball 

I think you would have better luck trying to get on Sylvan Learning center kid's team.

You would have to walk over and ask them hun.

You'll have to ask them

No, it's two guys against two girls. They are probably dating. All are wearing black shorts and so they have very strict about following their protocols and habits. The body language of hands on hips looks closed or demanding (to me).