They had the following children:

• Froukje (7 Jul 1918 - ?, 's-Gravenhage, Netherlands - ?)
• Hendrik Pieter (21 Apr 1922, 's-Gravenhage, Netherlands)

Notes:

• Employment: bidder or begrafenisondernemer - funeral director. His father's funeral company is featured on wikipedia (in Dutch). Both Hendrik Pieter's and Willemke's fathers, as well as their brothers, were funeral directors.
• Religion: Nederlands Hervormd - Dutch Reformed
• Family card of Hendrik Pieter Innemee:
• Supporting documents at the wedding:
• Witnesses at Hendrik Pieter's birth: Hendricus Zoons, 44 years old, tailor, living in 's-Gravenhage & Louis Kroes, 21 years old, widower, tailor, living in 's-Gravenhage
• Witnesses at Willemke's birth: Frederik Johannes Kramer, 23 years old, kantoorbediende, living in Arnhem & Bernard Lodewijks, 35 years old, bakker, living in Arnhem
• Witnesses at the wedding: Willem Fokke Bernard Johannes Kramer, 31 years old, funeral director, living in Utrecht, brother of Willemke & Wilhelmus Johannes Innemee, 34 years old, funeral director, living in 's-Gravenhage, brother of Hendrik Pieter
• Witness at Hendrik Pieter's death: Johannes de Groot, 64 years old, incasseerder, living in 's-Gravenhage

Sources:

1. "Netherlands, Zuid-Holland Province, Civil Registration, 1679-1942." Database with images. FamilySearch. http://FamilySearch.org : 14 June 2016. Nationaal Archief, Den Haag (National Archives, The Hague).
2. "Netherlands, Gelderland Province Civil Registration, 1800-1952." Database with images. FamilySearch. http://FamilySearch.org : 14 June 2016. Rijksarchief de Gelderland, Arnhem (Gelders Archive, Arnhem).
3. Digitale Stamboom Den Haag. http://denhaag.digitalestamboom.nl/