Sette dollari sul rosso (Seven Dollars on the Red) (1966)

A little boy is abducted by ruthless bandit gang leader El Cachal after Cachal and his men butcher the boy's family with the exception of his father. Johnny Ashley, the gunslinger father of the boy, goes searching for his son. Alas, the boy has grown up to be a mean and vicious criminal. Written by Woodyanders