I went through all my old files to find Sarah and Emma's six-month pictures to compare with Andrew's. I think that S & A do have similar features... there is something about the head and cheekbones. But, then you can kind of tell E belongs in the same family too even though S & A mostly take after Dennis and E takes after me. Maybe they're all just a mix of us!
Picture order: Sarah, Emma, Andrew
Regardless, I am a biased mom and I think they are all incredibly cute!