1. On 4 July the director of the University Hospital in Leiden registered the birth of
Willem Hoornik on 2 July 1882;
Sien’s occupation was given as ‘seamstress’. When Sien married Arnoldus Franciscus van Wijk (deceased 12 March 1916) at Rotterdam on 4 September 1901, he recognised Willem as his son. Willem van Wijk, as he was known from then on, died on 4 November 1958 at Maastricht (
GAM). See also
letter 224 and Hulsker 1993-2, pp. 41-53; cf. Wilkie 1978, pp. 181-207 (he insinuates that Van Gogh was the father).