bro let's stop the hate, shall we.
tough situation, rudeboyja, but hopefully we all agree that his pops has to know, sooner or later. and since you shouldn't depend on the kid to bring it up, that means you'll have to tell him. as for holding off...ehh...sounds complicated, right?
what kind of people are the kid and his father? it seems like you have a good relationship with the kid...what will the father do once he knows?
in any case, i think informing dad is probably the best thing to do. he may not like that you waited a month to tell him. maybe you can still help, but after letting the man know, and staying in line with what he sees fit. before you tell the father, though, you might consider talking to the kid about it (if he's mature enough, etc.) and letting him know that his father has to be informed...that may help preserve your relationship with the kid.