Dailey, Janet. Calder Brand (Series) #5

"At 24, Joseph Dollarhide is struggling to find his place as the future head of his ranching family. His father, Blake, may have been disabled in an accident but he's as domineering as ever. Joseph's childhood friend, Chase Calder, has inherited the rival Calder operation, and for both young men, longstanding battles over water and grass continue. But there's yet another weight on Joseph's shoulders. Years ago, Joseph abandoned his teenage love, Annabeth, to court glamorous Lucy Merriweather, a seductive trickster. The affair, of course, imploded, and Annabeth went on to marry a farmer, Silas Mosby, and have two children. But now Joseph has spotted Annabeth and her family in town ... and he has no doubt that her oldest, a boy, is his"--