Looking for my dad's other child from El Paso I never knew

El Paso TX

Description

I'm posting a picture of my grandfather (mom's dad) and my dad ( on right ) His name is Gary Duke. He passed away a few years ago in Illinois or Missouri. Can't recall for sure. I was born in 1969. My mom left because he was seeing someone else and she was pregnant. Not sure how close in time. But if anyone knows, I'd love to know more. I was Richard Duke at birth Thanks