Gilbert married Margaret Koster on 17 Dec 1888 in Manhattan, New York County, New York, United States. Margaret (daughter of Riner Koster and Margaret E. Brice) was born in 1868 in New York City, New York County, New York, United States; died on 17 Sep 1947 in Center Moriches, Suffolk, New York, United States; was buried in 1947 in Saint Raymonds Cemetery, Bronx, Bronx, New York, United States. [Group Sheet] [Family Chart]