The Mallen Streak by Catherine Cookson

Thomas Mallen of High Banks Hall had many sons, most of them bastards. But to all of them he passed on his mark—a distinctive flash of white hair running to the left temple, known as the Mallen Streak. It was said that those who bore the Streak seldom reached old age or died in bed, and that nothing good ever came of a Mallen.

Nor did it. In 1851, Thomas Mallen found himself a ruined man, forced amid scandal and disgrace, to sell the Hall and adjust to a new and very different mode of living. With him went his two young wards and their indomitable governess. Then, into their lives came the Radlet brothers of Wilbur Farm, one of whom bore the unmistakable Mallen Streak.

THE MALLEN STREAK is the first in a trilogy of novels following the fortunes of the Mallens through succeeding generations.