Per Wikipedia:

Graham has never been married and has no children. He helped to raise his sister, Darline Graham Nordone, after the deaths of his mother and father, which occurred within fifteen months of each other, leaving the two without parents when Graham was 22 and she was 13. Experiencing the early deaths of his parents, Graham says, made him mature more quickly, and Nordone, who introduced her brother at his formal announcement of his candidacy for the 2016 presidential race, said she hoped to be with him on the campaign trail frequently to show voters his softer side. "He's kind of like a brother, a father and a mother rolled into one," she said. "I've always looked up to Lindsey."

Sounds like he spent his young adulthood serving as a single parent to his younger sister, after the traumatic experience of losing both their parents in quick succession. Let's be civilized pedes, and be careful and kind when discussing his personal life.