I think you refer to Frank Kosta * abt 1902 California listed in 1910 and 1920 censuses as attached. Father Nicholas was born abt 1875 in Califonia (Dec 1874 acc. to 1900 census), Grandfather John ( prob. Giovanni Costa ) abt 1830 in northern part of Italy being a part of the Austrian empire at that time. 192o Colma , San Mateo, all others SF.