Here's my bit on this whole Christopher Dennis saying Sandy is his mom thing:
Given his age, it is possible. Sandy was, in fact, pregnant in 1965. She says she had a miscarriage, to her relief. If we take a walk in Crazyland for a moment, we could very well see how she could have gotten pregnant, realized she was not the maternal type (as she has said) and given the child up for adoption.
So his claim, though wacky, has some feasibility.
Personally, I think this guy is full of it. After watching "Confessions of a Superhero" one could safely say he is pretty damn weird. He is obviously slightly of the desperate persuasion in terms of publicity, money, fame, etc. So it's most likely a hoax he cooked up to gain attention. At which he has been moderately successful.
I'm definitely NOT agreeing with what he says. But at the same time, I can't 100% knock him. And, if he IS, in fact, Sandy's son, I totally wanna have his baby.

Yeah, nobody even fact checks this crap. Even USA Today printed this beep Unreal.
'Slippy flappy suck sook!'Lappy Slapsum, "The Rage of Friction"

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I think that guy is in his 40's so there's no way Eric Roberts is his Dad. You're right though, there's a number of lazy journalists that have reported Dennis is his Mom with no proof, including a USA Today article.