There is no Brooklyn bapt. for Jacob in 1750 not in 1752 or otherwise. Please share the source of his baptism.
Jacob Boerum marr. 25 Feb. Adriantje Remsen who is said born 4 Oct. 1753(this is not documented in church records but rather from paragraph of J. Ryker in Annals of Newtown. The will of Jacob Boerum 23 Jan. 1829 names all children:
Abraham Boerum 15 Dec. 1778---marr. Magdalena de Nuys (not certain)
Jacob Boerum (Jr.. 8 April 1786)---marr. Sarah Schenk 24 Oct. 1812
Jeremiah Boerum born 1789 died 1817
Henry Boerum 8 April 1793 marr. Susan Rapelje
John R. Boerum moved to Ohio (I have written a detailed article on him)
William Boerum 15 Apr. 1794?
Ann Boerum
Matilda Boerum marr. Gysbert Bogaert
I will confirm this data and add details.