Sandra Brown's Bittersweet Rain was published in 1984.
Sandra Brown - Bittersweet Rain book description:
Caroline Dawson survived the town gossips who whispered behind her back. She survived the slow death of her husband, Roscoe Lancaster, the richest man in the county and her senior by three decades. But she feared she might not survive Rink Lancaster, her husband's son.
Years before she married, when she and Rink were teens, he had introduced Caroline to her first tremulous taste of love - and then broke her heart.
Now Rink is back. He says he wants to settle his father's estate. But driven by a storm of emotions as undeniable as before and more dangerous than ever, what he really wants is to settle the score with Caroline.