von Kröcher
Altmark
Arms: Otto Hupp, Münchener Kalender 1927, Wikimedia Commons, gemeinfrei
Bertha was a daughter of Wilhelm von Gerlach. See also the marriage of Sophie von Kröcher into the family, to Jakob von Gerlach.
An ancient noble family of the Altmark (see also the marriage into the family under "Families That Married In"). Further details remain to be added from the Genealogical Handbook of the Nobility.
Sources: Degener Verlag, Deutsches Familienarchiv vol. 160 »von Gerlach – Lebensbilder einer Familie« (in German); Wikipedia articles on the families named; Wikimedia Commons (coat-of-arms images). Given to the best of our knowledge. Jürgen von Gerlach: von Gerlach. Lebensbilder einer Familie in sechs Jahrhunderten (Deutsches Familienarchiv 160), Insingen 2015 (in German). All sources. For corrections or additions, please contact the family administration.