i had a much more similar fight with my dad on chickens originating from wild fowl. So on a quick stop in Sumatra ( we were going to austrailia) i spotted 4 small chickens all the same color. i asked a local villager if they belonged to anyone. The old lady told me that it is forbidden to house and keep the fowl. So i asked if they were wild, she replied with a firm, but gentle yes. i asked her politely tell my dad about that, which she did. On the plane i looked over at my dad and said, "So, how was your chat?" He kept quiet and hasn't argued with me on chickens since.Hi faithsstuff...my husband is also a rocket scientist. He used to work on the space shuttle program and now works with missiles. He even has a t-shirt that says, "Yes, in fact, I AM a rocket scientist!" Hubby says your dad makes the other rocket scientists look bad and that they should take away his membership card and kick him out of the club.And hey, the more eggs your dad won't eat, the more for you to eat or sell. That's what I call a win-win scenario.
I had a similar fight with my father many years ago when we were on our way to tour a science museum. I said I couldn't wait to see a real Tasmanian Devil. My father scoffed and told me that there were NO such things in real life - they were just in cartoons. We argued quite heatedly about it until we approached the exotic animals exhibit where they had a lovely Tasmanian Devil specimen stuffed and on display. Boy, did that shut him up!
Note: Sorry for errors, as i am trying to type without looking at the keyboard.
My grandma had chickens when my dad was a kid and, well, she pretty much thinks she knows it all. She just came over to me at the computer and said, "Boy, you're getting a lot of eggs! Those roosters are working!" I don't say anything out of respect, but that was a major eye roll moment. Especially since I don't have roosters in my main flock. 
