Betje van Straaten (2 x a's) was a daughter of Hartog van Straten and Saartje Gompers, a family with ten children. One of her brothers was Jacob van Straten. Betje lived together with her sister Sientje van Straten in Den Haag and previously togehter in Rotterdam and Anderlecht (B).
Municipal Archive of Rotterdam, index of births and family registration card of Sientje van Straten.