@Heteroxon: You got a webcam? Set it to record for the night, show it to your parents afterwards (obviously cut out unneeded parts first). They'll have a hard time talking their way out of cold, hard video evidence.

I think I can pull that off with my iPhone. Unfortunately I can't afford much such as camera equipment. Hopefully I can catch him. I've thought about this before, but don't know why I haven't gotten around to it.