By Heller McAlpin Correspondent Do you know what a guncle is? I didn’t before I read Steven Rowley’s heartwarming new novel. But my children’s beloved guncle – that is, gay uncle – sure did. Rowley hits the sweet spot between hilarity and heart in this endearing charmer about a famous sitcom star who becomes the reluctant, unconventional guardian of his niece and nephew for a summer. As he demonstrated in “Lily and the Octopus” (2016), his debut novel about an adored pet dachshund’s illness, and “The Editor” (2019), about a struggling young writer whose editor, no...