C: HIM is a no-no in my house....To/Die/For, For My Pain and Poisonblack are OK though! Same with rap music! No kid of mine will be speaking about "bling" or "Fashizzle mah nizzle" without spending some time in the corner.
Well, like I said...kids can get rebellious in their teen years, so you may want to be more open-minded about the music so there's less chance that they totally go against you and having musical tastes you can't stand. At least then if you're not forbidding the rap, they won't find any need to gravitate to it. Most of the time if kids think their parents are OK with it, they won't touch it with a 10-foot pole!
So I guess aunt C. won't be invited to the house, the HIM fan that I am?