The Fugitive (1963)

Kimble reluctantly becomes involved with Stella Savano, the sister of George Savano, a mobster who runs the trucking company where Kimble works. Stella is an emotionally disturbed women with a dangerous attraction to Johnny, the adopted eight-year-old son of Jesse Stangel, Kimble's co-worker. Kimble learns that Stella is actually Johnny's mother. But Stella becomes so delusional that she thinks that Kimble is Johnny's father.