You don't want to mix with that gene pool,
rotfl...sooo true!!

So She is drinking grog and getting into punch ons with her mother...?? riiight!
Im guessing then that these people are not to be trusted with spray cans?

I think next Dr appt you should go with her, and ask the dr straight out.
Otherwise, if you cant get a definitve answer then leave her to it. If she is pg then get a paternity test done down the track. If she got pg in March (or feb) then you wont have long to wait before she shows. Are he boobs getting any bigger/fuller? How is she with raw meat and cooking fat?
Do you have any wheat laying around - you could get her to pee on that? lol

Anyway, I hope for you sake and for that child that she isnt pregnant!