Son of Gerard van Amerongen and Anna Susanna Hasselaer. Married (1781) to Susanna Arnoldina van der Goes (1763-1826).
Boswell mentions that on February 25, 1764, possibly at Madame Lockhorst's, the young child said about Boswell that "He is in love with my aunt", i.e. Madame Geelvinck - which was at the time quite correct.
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James Boswell's uncle John was a member of a sect known as the Glasites.