Joseph Wheelwright, Jr. (1729-1789) was the grandson of Judge Samuel Wheelwright, and the presumed enslaver of Zilph, whom he brought to be baptized in 1764.
"Zilph, Molatto, Bro't by Joseph & Mary Wheelwright" to be baptized on May 27, 1764 in the First Church of Wells.
The source of the genealogical information herein is FamilySearch.org record K4XY-K9P, which can be found at https://www.familysearch.org/tree/person/details/K4XY-K9P.
Joseph married Mary Curtis on Nov 22, 1745.
Bibliography:
Records of the First Church of Wells, as transcribed in 6 issues of the New England Historical and Genealogical Register, Vol 75-76, 1921-22
The Wheelwright Genealogy by Steve J Plummer (2010) available at https://www.google.com/books/edition/The_Wheelwright_Genealogy/0Q-MAgAAQBAJ?hl=en&gbpv=0