So I just saw this on Jon's sister's Facebook and HAD to share. This is Alice, Jon's sister's baby (6 weeks younger than Sophie), and Eliza, his other sister's daughter (7 months older than Sophie). Alice pretty much just did her own thing the whole photo shoot, but Soph and Eliza were all about... let's say... "interacting"... with each other!
Sarah's caption: Wow. I hope they like each other when they grow up.
If you don't remember, here's another one I posted a few weeks ago, taken right after this one: