Originally Posted by ratbastid

I think if there IS something to know--history of cancer, mental illness, diabetes, things like that--it would be best for him to know it. Apart from that, I'm with Ustwo; I don't see it does any good to tell, provided YOU can live with that.

We're jumping the gun, though. You're still speculating. Cousins sometimes have a strong resemblance. That photo isn't evidence.