Source: Records of St. Remigius Catholic Church in Retterath; and Albert Emmerich of Cremlingen, Germany who confirmed Gertrud’s birthplace and provided the date of her death.

Source of the information about Nikolaus’ birth and his parents: K-J Tonner’s Kelberg data file. Nikolaus’ parents were Peter Gundert of Gunderath and Maria Elisabeth Dreys of Kolverath. Nikolaus and Gertrud had five children.