It's funny, everyone says how much River looks like G and Riley looks like me- yet they both look like each other. Which makes sense when you think about it... They say that you are attracted to those who look similar to you in features, body structure, etc. and G and I have always felt I'm kind of a female version of him.
Well in sorting through old baby pics of us we are seeing that we sure looked a lot alike in our baby pictures and that the twins each look SO much like one of us (depending on the angle of the shot).