Fenna was the daughter of Salomon Lazarus Weinberg and sister of Lazarus Lazarus Weinberg, Abraham Weinberg, Betje Weinberg, Samuel Weinberg, Saartje Weinberg, Meijer Weinberg, Charlotte Weinberg and Mietje Weinberg.
Cousin of Fanny Weinberg-Weinberg and Sara Weinberg-Ruben.