On July 30, 1956, Prof. Siebert married Margaret Charlotte Siebert, nee Noyes. The matrimonial ceremonies were performed in Dieburg, Hessen, Germany. Margaret was born November 12, 1929, in Washington D.C., USA. She died of cancer on October 20, 1978, in London, Ontario, Canada.
If you would like to see pictures of Prof. Siebert's 2014 trip to Europe, they can be viewed, for free, on Shutterfly.