Operant Conditioning

I am learning in my new psychology class about operant conditioning among other things. Looking back on my childhood, I realize why my brother and I turned out the way we did. My parents are divorced, and whenever I would visit my father he would tell me to flex my muscle and he would tell me how much stronger I’ve gotten. He would throw the football with me and my brother. My dad and my uncle would always talk about how I would play football for Alabama. I didn’t exactly turn out a football player, but an athlete nonetheless. My brother, on the other hand, is a drummer in a band and no longer plays sports. He is a dedicated musician who works out a little on the side. He lifts weights but not too seriously and with no sprint training at all since quitting football 3 years ago he runs a 4.7 football 40. He has a very short temper. He is 17 years old 5"10 180 pounds and he bench presses 260. I am 5"11 and 3/4 195ish and run a 4.3 football 40 and bench 340 at 19 years old and also am of a volatile temperment. I think the reasons he didn’t stick with sports is because he was always disheartened by always comparing himself to me, which was unfair to him because I am 2 years older. I think he has/had just as much if not more potential than me. My sister played lacrosse/soccer when she was in high school. She was an aggressive beast. She now works for Apple. When she played powder puff football I watched her make 2 tackles and close line a girl… The were playing flag football. All of us were fast and strong compared to others our age. But I wonder if me and my siblings have natural ability or were psychologically influenced and conditioned by our parents actions. Any thoughts?