Because they transfer directly from father to son. If you copy your mother's ears, you must be a daughter. That is known to anyone investigating faces. I had that job professionally for over 5 years. I think I would know about that. Sorry if it contradicts your current belief, but if you don't believe me check whether the information is confirmed by other sources. As I've said - this is known. Everyone in my previous position would look for those same features. You can check Canada's current excuse for a president and Fidel Castro - same ears, same eyebrows, same nose, same mouth, same chin, etc. Features that confirm origin.

I only share this to spread knowledge. I have made mistakes and I am thankful to those who pointed them out to me. I am confident of my statement and I welcome you to check other sources to confirm it. Perhaps later you will show a better example that I didn't have and YOU will show me the knowledge I lack. Currently, I am adamant that ears must match in a direct relationship, they never skip generation. I hope you at least look into this before you totally dismiss it. I hope you understand my position.