Separated At Birth?
I was watching American Idol last night (I know, okay?) when I saw Kevin.

Who bears a striking resemblance to Ryan

There are a few explanations for this:
1) Ryan, your parents have been hiding your little brother from you.
2) Ryan, you fathered a child at age 7.
3) Ryan, your dad has another secret family. Or your mom does.
4) Ryan, you could have been the next American Idol!
All of the above are true.