ukeultimatum
I know i'm not a vampire but my brother sure is one.strange things have been happening to him at some nights. when he wakes up there's blood in his mouth dripping from it actually
I'll be the first to say this. Theres always the off chance that he may have bitten himself hard enough to draw blood from his tongue or cheek. Depending on his teeth theres also the possibility he could have cut his tongue or a cheek on a sharp enough part. I'm sure theres a condition or two that could link weak or sensitive gums to what you've described. The mouth seems to have a good tendancy to hide and/or stop minor cuts from bleeding.
Ignoring what I've said so far, I would like to point that due to the lack of activity in this subforum it may be some time before any real responses roll in, if at all. Though I won't deny that there is the chance you're right in some way, on some level, or in some form about your brother being a 'vampire'. I think more information from you may be necissary if you're looking for any information or something like that.