Exactly. Families share more than genetics. I once heard a radio spot where a woman spoke about herself and her sister's illustrious pole-vaulting career. She

Exactly. Families share more than genetics. I once heard a radio spot where a woman spoke about herself and her sister's illustrious pole-vaulting career. She scoffed at the idea that she had taken up pole-vaulting because her older sister did it, and said "obviously" they both had pole-vaulting genes