They probably don't even remember it. Unless it was a huge, major deal to them that you broke something very important, I'd doubt they even think about it. Also, kids do all kinds of things when they are little and adults know that it's all part of having kids around.
I would just let it go, but if you still can't, even when you realize they probably don't remember it, then tell them you have been thinking about when you were young and the stuff you did and apologize. Not a big, remorseful apology that can make them uncomfortable and think you are giving too much weight to stuff in the past but something like "I was kind of a brat about stuff like that, wasn't I? For what it's worth, I'm really sorry about it now." and then drop the subject. If they remember it, or still hold any resentment from it, they will tell you and you can work it out with them.
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I'm giving it another shot. We will see.
My forum is still there and everyone is welcome to come join as well. There is a private women only subforum there if anyone is interested. Also, there is no CAPTCHA.

The link to the forum is
http://www.rightplanet.proboards.com