The Cowboy's Lover (Harlequin Superromance No. 619)

"Who are his real parents? Jamie Conley wants to know. He's beginning to ask questions his adoptive mother, Lexi, can't answer. Questions her sister won't let her answer. The child is distracted for the moment when Lexi Kidnaps his idol, rodeo champion Jake Thorn. She needs Jake, her former brother in law, to manage the ranch- but only until her dad recovers from surgery. Jamie, of course, hopes he'll stay forever. What Lexi can't explain to him is that Jake's the last man she wants around and the only man she's ever loved." This is from the back cover of the book.