Anton Ludolf Duden
Born in Esens near Jever (Germany) on April 7, 1891, died in Semarang on August 23, 1931.
Son of Anton Karl Uhlrich Eduard Duden and Johanne Catherine Fulfs.
He was married in Salatiga on October 25, 1916 to Cornelia Theodora Sybesma,
born in Teloengagoeng (Indonesia) on November 19, 1898, Christened in Salatiga (Indonesia)
on May 11, 1902, died in Middelburg on May 23, 1973, daughter of Johannes Sijbesma and Anna Jansen.
(She was married afterwards to Boy Westveer.) 
From this marriage:
1 Anna Ulrica Clara Duden (Oeltje),
2 Anton Theodoor Duden ( Bolle),
3 Johannes Martin Carl Duden (Beppy),
4. Friedrich Otto Ernst Duden (Dolly),
5 Theodoor Ludolf Duden, (Nono)
6 Mona Norma Catharine Duden, (Mona)
7 Ludolfina Geovanna Theodora Duden (Ludy)
Salatiga, July 1937