There is a GEDCOM file at ancestry.com posted by Peter Champion (descendant of Huldah McC., resides Visalia) which lists Jehu Roberts as the father of Mary Jane Roberts.
According to the 1880 Census data for Mary Jane Roberts, her father was born in England, and her mother in Pennsylvania.
There is a Jehu Roberts listed in the 1820 U.S. Census for Drumore Township, Lancaster County, PA, page 292.
Wed., Aug. 31, 1842 Lancaster Examiner & Herald, Marriages, p. 3: BOYD-McCONKEY.-On Thursday the 25th inst. by the Rev. Mr. Baker, Stephen W. P. BOYD, of Peach Bottom, Lancaster county, to Mary Jane [McCONKEY], eldest daughter of Andrew McCONKEY, Esq., of York County, Pa. FELLENBAUM-BUTTS.-On the 30th inst. by the same, Mr. Reuben FELLENBAUM to Miss Elizabeth BUTTS, both of Manheim township. JORDAN-SHOCK.-On Thursday the 18th August inst. by John Webster, Esq., in Little Britain township, Dr. Andrew Mitchell JORDAN, of Cecil county, Md. to Miss Rebecca C. SHOCK of the same place. ROBERTS-JOHNSON.-On Tuesday the 23d August inst. by the same, Mr. Jehu ROBERTS to Miss Rebecca JOHNSON, all of Little Britain township. KREIDER-LEFEVER.-On Thursday last, by the Rev. Mr. Strine, Mr. Henry KREIDER, of Leacock, to Miss Susan LEFEVER, of East Lampeter.