Hello,
I’m not related to the family, but I found a family card 1892-1920 in the archive of Amsterdam. I have a copy of the family card.
Wilhelmus Adrianus Metzger, born November 24, 1891 in Amsterdam, went to North-America on July 26, 1920.
His wife Fennechiena Alida ten Berge, born October 9, 1894 in Noordbroek, went to North-America on November, 4, 1920, together with Hendrikus Wilhelmus Metzger, their son born on December 26, 1918 in London, Great-Brittan.
This are the register and de-register dates in the population registers.
There are no other children mentioned.
Maybe this helps.
Regards,
Robert A. van Duuren
The Neherlands.