This is a very interesting scenario right here.
The OP
@toocool6600 either :
a)really wants to help because the issue bothers him and affects him at a deep level (may be you OP and this is quite rare - people who truly care)
b)just wants to troll,be a white knight (not saying it's you OP but stuff like this is more common,isn't it
)
In case of case A,OP will find out a way to help even if a 100 more folks from the forum advise against it.
My basic suggestion is quite similar.
If it really bothers you,you will get involved and no one can stop you.
And since you will get into this,I suggest you get backup or protection.
It appears as if the family wants their guy to change but they want to pull the trigger off your shoulder which sucks.Hmmmm...be very aware & cautious about this...since I can understand that you want to help.
I suggest you find a way to contact :
a)Police
b)NCW
c)Local MLA,MP,Women's team
d)Any one else whom you think can help - like their neighbours,other witness,relatives.
And then (the most important step) :
Ask the family members to file the case,ask them to get a witness (their neighbour or other friends & NOT you) and help them through the process.
Make it like a social intervention - use the concept of distributed responsibility (from Distributed Computing) so in case there's failure,there won't be a single point of failure in the worst case (YOU,as many folks here suggest)
This way you :
a)Will help them (which is what you truly want i hope)
b)Insulate & Protect yourself first and more importantly your family whom you love the most while helping the rest of the world.
Wish you all the very best and do let us know how you handled it and how it all works out