Saara Wallerstein

Ewa, Julia, and Ana's birth records all give their mother's name as Rachel. Joseph's Familiant record gives his wife's name as Saara and Baruch's children's birth records give their grandmother's name as Sara.

It is possible that Joseph's first wife and Baruch's mother was Sara Gans, but the 3 daughters' mother was Sara's sister Rachel Gans.

1793 census: http://pvh.ff.cuni.cz/zidi/Litomericko_1793.pdf Confirms that Sara and Rachel were sisters, two different women.