1. Hendrikus Johannes SEESINK "Henk" was born 24 Aug 1894 in Vlaardingen, Netherlands. He died 16 Feb 1975 in The Hague, Netherlands.
Henk married Cornelia Apolonia Petronella ZUIJDWIJK "Nel", daughter of Johannes ZUIJDERWIJK and Johanna Maria VIJFTIGSCHILD, on 24 Aug 1921 in The Hague, Netherlands. Nel was born 28 Nov 1893 in Loosduinen, Netherlands. She died 3 Apr 1957 in Wassenaar, Netherlands.
They had the following children:
+ 2 M i Antonius Hendrikus SEESINK was born 3 Oct 1930. + 3 F ii Johanna Cornelia SEESINK was born 14 Oct 1922 and died 26 Oct 2000. 4 F iii Cornelia Alida SEESINK "Conny" was born 19 Dec 1923 in The Hague, Netherlands. + 5 M iv Hendrikus Johannes SEESINK was born 23 Sep 1928.