I Don't Want to Know!

Really, I don't. Because I have a dirty mind and I'm gonna automatically think that the family secret is brother/sister incest!!  Look at the picture - they're related, right? They both have that look like they're one chromosome short of Down's. And what's with his hands - does he have twelve fingers? Is it the entire family's secret? And why are they clutching each other in a void? Where the hell are they supposed to be - in front of a photo screen at the local JCPenney Portrait studio?