Johan was the oldest son of
Pieter de Graeff and his cousin
Jacoba Bicker, sister of
Wendela Bicker, who was married to Grand Pensionary
Johan de Witt. He was given his first name Johan in memory of De Witt, who was murdered in Rampjaar 1672. His elder brother was
Cornelis de Graeff II. who became
Free Lord of Purmerland and Ilpendam, his younger sister
Agneta de Graeff was married to
Jan Baptiste de Hochepied, who lives in a City-Place in The Hague today called
Kabinet der Koningin. After his studies at the
University of Leiden in the year 1699, he became an advisor and from 1709 to 1714 a member of the
vroedschap of the City of Amsterdam. De Graeff residence at the
Herengracht in a house now called
Tassenmuseum Hendrikje, at castle Ilpenstein and at
Bronstee, a Countryhouse near
Heemstede. In the year 1709 Johan married Johanna Hooft, they had five children: • Jacoba Adriana de Graeff (1710–1745), married to Mr Jacob Jan de Blocq van Kuffeler, deputy of Frisia •
Gerrit de Graeff I (1711–1752), married to Maria Elisabeth Sautijn and later with Elisabeth Lestevenon; Gerrit succeeded him as Lord of Zuid-Polsbroek • Alida Joanna de Graeff (1713–1757), married with Mr
François de Witt, burgomaster of Amsterdam ==Art collection==