Have you seen this other person's research, Jood?
http://www.fayewest.ca/jones/p560.htm
She has Christianah Folk b. 1 Apr 1746, daughter of Johannes Folk b. 1705 d. 1784 and Anna Mary (Mareitje) Speikkerman. Christianah married James Jones b. 1733 d. 1794. Their son Andrew Jones b. 11 Jan 1767 d. 23 May 1850.