Compare the shape of faces of brothers and sisters. dont you find youngers' faces more rounded?

Question

remember JFK and his brothers. they are typical like me and my brother.

why does this happen?

Answer 1

The youngest in my family, does have a round face. But then, my mom too have a round face and she is not the youngest in her family. Thats all came to my mind.

You know, it would have been easier if you had given link/s to pictures of siblings. Just one example - JFK and his brothers - isn't enough. It is kind of tedious to think or search for siblings. I guess that is why none have answered this question though it is interesting.