His father Lieve Geelvinck married Johanna's mother Anna de Haze the year after.
On 9 November 1747, during the Taxleasers uproar, Nicolaes Geelvinck - the only burgomaster present - quickly had to flee the city hall on Dam Square, before the mayors room was occupied by the people and a ceiling mob was stuck from the window to make clear, the place was cleaned.
The result of the tax leaseholders uproar was the Doelistenbeweging, a group of mainly Calvinist merchants, trying to put limits on the powers of the mayors and the Jewish streetvendors.
A recently introduced income tax unique in Europe, also aroused resistance, although it affected only the richest (5%) of the population.
In 1749 Nicolaes inherited 90,000 guilder from his great-aunt Sara Hinlopen: shares, bonds and farmland in one of the oldest polders, the Zijpe.
(The canalside mansion on Herengracht 509-511 was demolished in 1917 due to the widening of the Vijzelstraat; parts of the interior were moved to Amstel 218).