[ttiokjbnhjjillp]

try to bring deen into your house somehow, i would say that if you have control over the internet block websites like facebook

as for these guys, if they are Muslim i would suggest that you speak to their parents rather than hurt them and risk getting in trouble with the police again as this will stress your mother out

talk to your sister openly, tell her that you know you have made mistakes in your past and tell her of your regret, tell her when you grow up these things stay with you and haunt you and people talk trash about you and you don't want her reputation to be ruined. Instead of shouting... talk to her as a friend, tell her you care for her and your only protective because you want the best for her

ask her if she wants to get married...even if she says she wants to marry her boyfriend its likely he will back off himself when she mentions marriage!
but its better for her to be married than to be committing zina

may Allah azza wa jal make things easy for you...Aameen