 Johannes van der Werf, son of Johannes Feddes van der Werf and Anna Harings Romkes.Born 3 May 1872 Heerenveen, died 24 Feb 1939 Rotterdam, age 66 years, buried Amsterdam Married 4 May 1894 Doniawerstal, age 22 years (married 1 years) to:  Sipkje Herres Rijpkema, age by marriage 20 years, daughter of Herre Tjitskes Rijpkema and Grietje Jans Landman.Born 15 Jan 1874 Doniaga, died 18 Oct 1895 Doniaga, age 21 years, buried St. Nicolaasga | |||
| 2nd marriage Johannes van der Werf, son of Johannes Feddes van der Werf and Anna Harings Romkes. Married 8 May 1897, age 25 years (married 41 years) to: Geertruida Wiersma, age by marriage 29 years, daughter of Watze Jans Wiersma and Elisabeth Reins Hettinga.Born 27 May 1867 Tirns, died 5 Mar 1945 s-Gravenhage, age 77 years, buried s-Gravenhage Children: 1. Sipkje Maria van der WerfBorn 26 Feb 1898 St.Nicolaasga, died 6 Sep 1914 Amsterdam, age 16 years, buried Amsterdam 2. Elisabeth Maria van der WerfBorn 20 Jul 1899 Doniaga, died 11 Oct 1899 Doniaga, age under 1 year old, buried 14 Oct 1899 St. Nicolaasga 3. Watze Josef van der WerfBorn 6 Jun 1902 Doniaga, died 10 May 1980 Coevorden, age 77 years, buried Coevorden | |||