Coming home from work, I was blindsided when my son, Caleb, said, “Mom said you’re not my father, and she’s leaving us.” My wife, Nira, was unreachable, leaving me in near tears. When she returned, she explained it was a misunderstanding—Caleb overheard her venting to her sister, saying I’d been “distant,” not denying my paternity. Nira and I struggled to...