In the Baltimore Families 1659 to 1759 p. 321 the following islisted.
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James Henthorn and wife were in Baltimore Co. by April 1745 when they conveyed 100 a. Providence to Jacob Hoak, Weaver (79:49)
John Henthorn and wife Margaret conveyed 100a. Providence to James Henthorn and 272 a. of the same tract to Mathias Smyser on 3 May 1745 (77:688, 690)
This is not the John Henthorn that married Margaret Downard as they would be considerably younger.