My father had a maternal twin. Other than both being 6’2” they had nothing in common. My father was outgoing. My uncle was reserved.
My father was into team sports. He was a three sport star in high school. He was recruited to a Big Ten for football. After getting injured he transferred to what is now a NESCAC and played baseball. He was a fifth generation legacy admit.
My uncle was quiet and reserved. He was into individual sports. He didn’t play high school sports. He became a NASCAR driver. When he decided driving was a bit hairy he became a NASCAR official.
As adults their personalities were opposites. They didn’t like each other.