Question: What was Jan Baptist van Renseelaer's father's profession?

Documents:
source: Kiliaen van Rensselaer (merchant)
text: Kiliaen van Rensselaer (merchant) Kiliaen van Rensselaer (] ; 1586 – buried 7 October 1643 ) was a Dutch diamond and pearl merchant from Amsterdam who was one of the founders and directors of the Dutch West India Company, being instrumental in the establishment of New Netherland.

source: Jan Baptist van Rensselaer
text: Jan Baptist van Rensselaer Jan Baptist van Rensselaer (Amsterdam 18 March 1629–Amsterdam, 24 October 1678) was the second son of Kiliaen van Rensselaer, the first Patroon of the Manor of Rensselaerswyck.

source: Jan Baptist van Fornenburgh
text: Jan Baptist van Fornenburgh Jan Baptist van Fornenburgh (1585 in Antwerp – 1650 in The Hague), was a Dutch Golden Age flower painter.

source: Johannes Pharamund Rhumelius
text: Johannes Pharamund Rhumelius Johannes Pharamond Rhumelius (1597–1661) was a German alchemist and physician, and a contemporary of Jan Baptist van Helmont. He was born in Neumark and died in Nuremberg.

source: Jan Baptist van Deynum
text: Jan Baptist van Deynum Jan Baptist van Deynum, or Duinen (1620–1668), was a Flemish Baroque painter.

source: Jan Baptist van Helmont
text: Jan Baptist van Helmont Jan Baptist van Helmont ( ; ] ; 12 January 1580 – 30 December 1644) was a Flemish chemist, physiologist, and physician. He worked during the years just after Paracelsus and the rise of iatrochemistry, and is sometimes considered to be "the founder of pneumatic chemistry". Van Helmont is remembered today largely for his ideas on spontaneous generation, his 5-year tree experiment, and his introduction of the word "gas" (from the Greek word "chaos") into the vocabulary of scientists.

source: Dorotea van Fornenbergh
text: Dorotea van Fornenbergh Dorotea van Fornenbergh (born between 1647 and 1654 – died after 1697), was a Dutch stage actor. Born to theatre director Jan Baptist van Fornenbergh (1624–1697) and actor Helena Heusen (ca. 1622–1680), married in 1696 to Johan Hauman Gal.

source: Franciscus Mercurius van Helmont
text: Franciscus Mercurius van Helmont Franciscus Mercurius van Helmont (baptised 20 October 1614 – 1698 or 1699) was a Flemish alchemist and writer, the son of Jan Baptist van Helmont. He is now best known for his publication in the 1640s of his father's pioneer works on chemistry, which link the origins of the science to the study of alchemy.

source: Jan Baptist van Heil
text: Jan Baptist van Heil Jan Baptist van Heil (1604 in Brussels –1685) was a Flemish Baroque painter.

source: Susanna van Lee
text: Susanna van Lee Susanna van Lee (ca. 1630 – buried 13 January 1700) was a Dutch stage actor and ballet dancer. She was married to Conrad Rochus Eeckhout (ca. 1630–1701), musician. She was a member of the theatre company of Jan Baptist van Fornenbergh (1624–1697), and as such toured in Northern Germany, Denmark and Sweden. She was also active at the theatre of Amsterdam in 1655–1700.

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Answer: diamond and pearl merchant