What we know about your Jonathan Houston Rummel is:
In both 1850 and 1860 he was living with wife Elizabeth in Green Township, Indiana County, PA. The ages given in the two census records imply a birth around 1822 (per 1850 census) or 1817 (per 1860 census).
On 20 December 1862 he and his wife Elizabeth sold 170 acres of land in Green Township. As recited in the deed for the sale, this was land he had bought 26 November 1842.
He almost certainly is the same as the Jonathan H. Rumel who, together with his brother Harmon Rumel, on 28 March 1842 sold a small lot they had inherited from their father John Rumel in Mahoning Township, Indiana County.
Thus, your Jonathan H. Rummel is the same as the Jonathan H Rummel who appears in the 1840 census in Mahoning Township as a male in his 20s. The other male in his 20s in this record very likely is his brother Harmon. There is also a female in her 50s, who almost certainly is the Elizabeth Rummel, age 66, who lives next to him in 1850 and thus almost certainly is his mother.
The father John Rummel had bought the land in Mahoning Township 13 April 1836, at which point he was already a resident of Indiana County. He was dead by 1838 when his heirs quitclaimed a portion of that tract to Jonathan H. and Harmon Rummel. The latter deed specifies that John Rummel died intestate, so there is no will.
I have not found a John Rummel in the 1830 census for Indiana County, nor have I found a reasonable candidate elsewhere (with a wife in her 40s and two sons in their teens).
So what we can say is that your Jonathan Houston Rummel was the son of a John Rummel who died in Indiana County, PA, between 1836 and 1838 and his wife Elizabeth who was born in the mid-1780s and still living in 1850 in Indiana County.