I... really don't think it would help all that much if I tried. ()^_^ For one, explaining things to people with spoken words has never been my forte---I sweat bullets, I repeatedly stumble over my words, and inevitably I'll be at a complete loss for things to say. For another, there's no getting around the fact that the main games in Touhou are, at their core, shoot-'em'-ups; saying "oh, they don't die, they just disappear" isn't going to cut it with my parents. (And even if it
was, they'd probably argue that games that cause an undue amount of frustration probably aren't worth my time. Yeah, Subterranean Animism, I'm talking about
YOU. )
Certain games or series they don't have as
much of a problem with me playing. Sports games they generally don't mind, and I think they've played Wii Sports at least once; the Super Mario series (at least, the NES trilogy and Mario Kart 64) was alright as long as
they didn't have to play... Educational games like the Carmen Sandiego series (and, when I was having trouble with my math classes, Alge-Blaster) were okay by them. (And strangely, my dad was fascinated by Duck Hunt and how the NES Zapper interacted with the television. Too, my mom at one point liked watching us play Paperboy.)
On the whole, though, I'd rather not trouble them with my choice in gaming. As long as I don't bother them about it, they don't bother me about it, and that's good enough for me.
Waiting for them to leave the house before I start playing shouldn't be much of a problem.