I also have an 11 year old son and it was almost impossible for him to NOT hear the news about Tiger. Rightfully so his opinion of Tiger has turned 180 degrees. I can't blame him.
Tiger paved his own path by showcasing a squeaky clean image and accepting endorsements to promote that image. Don't get me wrong everyone makes mistakes, but the mistakes he made went totally against the moral character he promoted and/or endorsed.
In my humble opinion Tiger will always be the best golfer EVER. But it is a shame that his image will forever be damaged and that this will forever overshadow his golfing accomplishments.
So I would tell your 11 year old son that Tiger did admit to cheating on his wife, but that he has yet to admit that he has used enhancement drugs. Unless Tiger admits to such and since there is no physical evidence to corroborate that fact, no one can really make that determination unless you are God himself.....
By the way....Ready-Go tournaments rock! =D