Her parents were Johann Adolf Klein and Catharina Margaretha Engels.
Sources
Marriage Index: "Deutschland Heiraten, 1558-1929", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:J484-YBD : 14 July 2021), Hubert Joseph Willekens in entry for Hubert Peter Willekens, 1873.
Zivilstand der Stadt Aachen, Aachener Allgemeine Zeitung, 23.01.1902
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