Ensko was born in 1896 in New York City to Robert Ensko (1855-1934) and Mary Elizabeth Blakeley (1857-?). He married Dorothea (1892-1977) on June 4, 1918 in Manhattan. They had three children: Dorothea Charlotte Ensko (1920- ) who married Vernon Charles Wyle (1913-1986); Stephen W. Ensko (1922-c1945), who was a 2nd Lieutenant in the US Army who was killed in action in World War II; and Alice Elizabeth Ensko (1924-1999), who married George M. Kellar II on December 24, 1944, and later married Alfred Woodward (1913-2007), the Illinois judge.