These two are absolutely nothing alike. Their personalities are polar opposites - Kate is light and silly and boisterous, while Willa is serious, intense, and (mostly) quiet. In their first year, they had nothing to do with each other, but now they are finding their way to a real sisterly partnership. I often come across them whispering, giggling and plotting with their heads together, and they have these long, back-and-forth conversations now - I have no idea what they are saying usually, but they seem to understand each other. I love to see this relationship growing.