Per the LDS website, Lodwick Hardenbrook and Elizabeth Waldron had 11 children:
Jerome b. 15 Apr 1781 NJ
John b. 21 Sep 1783 NJ
Ralph "Rafe" b. 14 Apr 1787 NJ
Lydia b. 9 Jan 1789 VA d. 10 Jul 1861(?) OH
Lewis b. 2 Jan 1792 VA d. 10 Jul 1861 IL
Samuel b. 8 Feb 1794 VA
Magdalene b. 19 Feb 1796 VA
Abraham b. 18 May 1798 VA
Francis/Frances b. 4 Dec 1799 VA d. IA
Elizabeth b. 15 Apr 1804 OH
William b. 29 Aug 1808 OH d. 27 Dec 1859 IL
Lodwick was granted land in the vicinity of Mt. Gilead, OH in payment for his service in a NJ regiment in the Am. Rev War. He had homesteaded there fairly early and there are several mentions of him and his sons in the History of Ohio which you can find at www.heritagequest.com
Given that West Virginia wasn't created until the 1860's the reference to Brooke, VA where Samuel & Francis were born is most likely Brooke County, WV on the Ohio River. So this indicates a migration from Somerset, NJ in 1787-1788 to Brooke County on the Ohio. Then from there they moved the Mt. Gilead, OH area. Mt. Gilead is north of Columbus--I'm guessing 40-50 miles.
I've found a brother of Allan Hardenbrook's, Hanibal Hardenbrook, who is in Bowling Green, Pettis Co, MO in the 1870 census.
If your Francis Marian Hardenbrook served in the CW, the dates would make sense that he's the son of a brother of my Frances. If your Samuel was born in 1794 in VA, he would have been 5 years older than my Frances. It would also have made him a first cousin of my GGGrandfather, Allan Hardenbrook who was born in 1831.
How are you related to FMH? Does that make us cousins?