Kathleen’s Nephews Michael, Bill, and David (left to right) are adults now, with quite different personalities, abilities, offspring (4, 2, and none), and contexts (in Massachusetts, Pennsylvania, and California). Yet despite distinct genes, prenatal life, and childhood influences, they shared the influence of Glen and Dot, Kathleen’s brother and sister-in-law—evident here in their similar, friendly smiles.

GREG STASSEN