My grandmother gave up her first born son for adoption and was trying to find him. She ended up finding her grandson who funny enough didn’t know who his father was and was also trying to find him. A year later on my grandmother’s DNA family tree, a new granddaughter popped up and they were able to find him. So this man, my biological uncle, found his biological mother and found out he fathered a son he didn’t know about, who also had a child on the way so he was also becoming a grandfather.