THESE ARE 2 VERY DIFFERENT HENRY GARMANS (and too many trees have blindly copied this wrong information).
The Henry Garman who married Susan Achey in 1835 in Elizabethtown, Lancaster county, Pa was born 19 Dec 1805 and died in Lancaster county on 4 Feb 1876. His wife Susan was born Susan Achey on 16 Feb 1813 and died in Lancaster county on 14 Jan 1892. They are BOTH buried in the Mt. Joy Cemetery in Lancaster county, Pa. They were the parents of Lavina (Shenk), Isaac, Nancy, Henry, John, Lucy and Mary Achey Garman. The parents of this Henry Garman are unknown but it is strongly believed that this Henry was born in Lancaster county, near where the border with York county now is.
The Henry Garman who married Hannah Rebecca Groff in 1831, was born 4 Aug 1806 in Dauphin county and died 24 Apr 1892 in Lycoming county. He was the eldest child born to George Garman and Rebecca Bitzer of Dauphin county. Henry and Hannah Rebecca Garman's children were Mary, David, Jacob, Rebecca, Hannah and Henry.
I do wish all these people who so blindly copy other people's trees would do some cursory checking on their own to verify that what they are copying is actually TRUE! You are NOT 'into genealogy' if you do not verify sources - you are just into repeating others' careless mistakes.