I’ve often thought that as well.
The opposite of that is my Mother-in-law’s family.
Cancer has killed all her brothers, 5 of them, but all her sisters, 5 of them, are still alive...........
in my mother’s immediate family, her parents and sister died of cancer and no one lived longer than 50 years old. My mother made it to 85, but she finally got cancer herself and passed before Christmas. The cancer she got was extremely rare. Her parents and sister didn’t have a rare cancer as far as we know - parents had colon CA and sister died of lung cancer (she smoked).