A Josiah Funny

So, yesterday Josiah and I were reading books together. He chose the book A Mother for Choco which is about adoption and how some families don't look alike. After reading the story a couple of times we began to talk about how Choco did not look his mother Mrs. Bear. I asked him if he thought that he and I looked alike. This is how the conversation went from here:

Josiah - Oh! No!
Me - how do you think we look different?
J - Well, I have short hair and you have long hair.
M - anything else?
J - I have a small bottom and you have a big bottom!

Needless to say I about fell on the floor laughing. He did not think my response was very kind or appropriate. We ended our conversation with things about us that are the same.