Short Shorts: Parents, how short is too short?

I'm 21 yr old mother and I personally like short shorts as long as no butt cheeks are hanging out, but i know a lot of people who think that anything above the knee is skanky.
So, how short is too short? What length would you allow you children to wear and what would you wear?

Thanks. :)
Update: Are these too short? http://cdn1.atwestfield.com/img_resized/...
Update 2: Are these too short? http://cdn1.atwestfield.com/img_resized/...
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