I'm unclear on exactly how the kids would pick up the virus. I really can't think of a viable scenario that would work at all. Even if he has a open sore on his face, are you afraid that he's going to rub it on their open wound? You stated blood-to-blood transfer is your only concern, but I don't know of even any anecdotal evidence of transfer that involved pools of blood outside the body and no sharp objects. I'm certainly no expert, but it seems that kind of transmission would be discussed amongst those who are experts as to the real-world viability of the virus outside the body.
My confusion aside, kudos on taking in the black sheep. He may be "your" freeloader, but sometimes people just need that little bit of help to turn things around. I certainly hope that you're the ones to help your family member. Good luck!
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"We have met the enemy and he is us." - Pogo
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