Siegfried Richard Paul Blankenstein was the youngest child of Gottfried Friedrich August "Fred" Blankenstein and Marie Dorothea Elisabeth (Friedrichs) Blankenstein.
Siegfried Blankenstein was baptized October 21, 1906, by Pastor C. Wolff at St. Paul's Evangelical & Reformed Church in Gerald, Texas. His baptismal sponsors were Richard Schmaltz, Paul Lehmann, and Louise Weissinger.
Siegfried Blankenstein was confirmed April 6, 1919, by Pastor John Link at St. Paul's Evangelical & Reformed Church (now St. Paul's United Church of Christ) in Gerald, Texas.
Siegfried married Noda Mae Inglis on Dec. 14, 1926, in Fort Worth.
They were the parents of five children.
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OBITUARY FROM THE FORT WORTH STAR-TELEGRAM, Sunday, June 9, 1985

BLANKENSTEIN

SIEGFRIED BLANKENSTEIN, of Fort Worth. Survivors: Wife, Noda Mae; son, Billy; daughters, Doris Hightower, Mary Wilson, Sheron Shaw, Betty Fielder; 17 grandchildren; 15 great-grandchildren. Services 10 a.m. Monday Bluebonnet Hills Memorial Chapel. Rev. R. R. Wall officiating. Interment Bluebonnet Hills Memorial Park. Arrangements BLUEBONNET HILLS FUNERAL HOME, 5725 COLLEYVILLE BLVD, COLLEYVILLE.
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Siegfried Blankenstein was preceded in death by his parents, Gottfried Blankenstein and Marie Friedrichs Blankenstein; his brothers, Herman, Richard, Paul, and Freddie Blankenstein; his sisters, Mamie Lehmann, Rose Blankenstein, Elsie Forkel, Alma Banik, and Elfriede Bode; and an infant granddaughter.
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Siegfried was the last surviving child of his parents, Gottfried and Marie Friedrichs Blankenstein.