Louis Herschel and Sophia van der Wijk had two children: Nathan and David. Both of them were married. Nathan lived somewhere. David lived at the same address as his parents, together with his wife.
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A neighbour of the Herschel family mentions them in her published diary. I. Boudier-Brouwer, Met de tanden op elkaar. Dagboeknotities 40-45 (Amsterdam/Antwerpen…