Father of actor Arnaldo Ninchi, grandfather of actor Alessandro Ninchi, brother of actor Carlo Ninchi, first cousin once removed of actress Ave Ninchi, first cousin twice removed of actress Marina Ninchi, father-in-law of actress Renata Negri.
Father of Marcello Mastroianni twice: La Dolce Vita (1960), Marcello's father and 8½ (1963), Guido's father.