He's got a little sister.., that gets in the way of this relationship getting any further Options

[Chanfleh]

So recently a friend of mines asked me out, and I said yes because yeah I liked him too blahblahblah that's not too important. Anyways, we haven't come around to kissing because of his younger sister. We never have time alone because of her, and our friends (our friends clash.. they don't like each other). His dad is strict, so she'll tell if we were to kiss. (I swear his dad treats him like if he was in elementary school..) Our only communication is through notes.. because again, younger sister. Any advice in how I can get some alone time with him before, or after school? And maybe if I can do anything about his younger sister?