how do i start this relationship?

So heres the story.
I have a huge crush on this guy who is 4 years older than me and goes to a completely different school. My dad and his dad are great friends, and we are often seeing each other.
The thing is, when i try to flirt with him, he ignores me. last week me and my friend and him and his brothers were talking , and the conversation sidetracked and he ended up just walking away. he never even talked to me and the only thing he said, ever, in 4 hours time, was "Jackie (my friend) and Paris, get away from me! (laughing)". He is not allowed to date and neither am I, but something tells me that he likes another girl and has no apparent interest in me. Please help me, what should I do????????