What are the chances I could have with this girl (please answer)?

I think it's a bad idea to do it at your house. Your sister and everyone else would hear so don't do that. Try maybe getting a motel room, at her house, wait until all your family is out of the house and call her to come over. First you should ask to be friends with benefits first. If your super quiet you might get away with doing it in the living room after your sis goes to bed. Idk anything else to try though..................................… ........................................… ,.......................................… ........................................… hopefully this is the longest answer jk lol