They had the following children:

• Johannes Hermanus "Joop" (14 Nov 1912, Utrecht, Netherlands)
• Elisabeth "Betty" (after 1913)

Notes:

• Employment: kantoorbediende (office worker) or zaakwaarnemer (solicitor, attorney)
• Witnesses at Willem Fokke Bernard Johannes' birth: Bernard Lodewijks, 28 years old, bakker & Fokke Mulder, 24 years old, kantoorbediende, both living in Arnhem
• Witnesses at Johanna Maria Clasina's birth: Heinrich Wilhelm Sardemann, 48 years old, koopman & Reinier Frederik Ploegman, 84 years old, unemployed, both living in Arnhem
• Witnesses at the wedding: Rut Hagenbeek, 46 years old, koopman, living in Arnhem, cousin of the bride & Jan Frederik Barneveld, 74 years old, unemployed, living in Arnhem, grandfather of the bride & Frederik Johannes Kramer, 44 years old, uitgever, living in Arnhem, uncle of the groom & Wilhelmus Johannes Innemee, 56 years old, begrafenisondernemer, living in 's-Gravenhage
• I've heard from my grandfather, Willem Fokke Bernard Johannes' nephew, that when Johannes Hermanus Kramer went to register his newborn son at the town hall, he went with two of his friends (the two witnesses). Froukje Mulder had instructed him that the child's name should be Willem. Apparently they were already quite drunk when they arrived, and the friends asked Johannes if he wouldn't mind adding both their names to "Willem", at which point Johannes realised he also wanted to add his name. The story goes that Froukje was not amused when she found out what they had done.

Sources:

1. Gelders Archief, Arnhem, archief 207, inventarisnummer 84, 26 februari 1885, aktenummer 260
2. Gelders Archief, Arnhem, archief 207, inventarisnummer 7996, 23 februari 1912, aktenummer 65
3. Centraal Bureau voor Genealogie, VFADNL079106-300, 9 juli 1963
4. Gelders Archief, Arnhem, archief 207, inventarisnummer 87, 1 mei 1888, aktenummer 559