What really works against Vempires? Cause garlic doesn't...?

I think that my mom's new "boyfriend" is a vampire. He leaves before dawn, and comes to see her after dark. Sometimes he comes in through the window. We live on the 6th floor. I mean I never saw him fly or anything but I ume he came in through the window because I never hear the doorbell ring. So I dissolved like a full bottle of 1000mg Garlic tablets in his coffee... A couple of hours went by, nothing happened, I thought for sure he was coming out of the bathroom with fangs and a cape (took him long enough in there). I gave him a cross with jesus on it for last fathers' day, but he doesn't wear it because he says he has different beliefs than I do... I bet he does! I tried to aske a priest online, but all he was interested in was how old I was and not really helping me with my problem. I am so scared right now I can't go to sleep. They are in the living room drinking red wine and listening to some Ossie Ausborn (sorry spelling?) cd. I don't want to be bited on the neck & be Jewish.