On the 1840 Census, it would appear that he is living next door to William REEDER, an older man. One could surmise that William was his father. Possibly son of Daniel H REEDER of NJand Rebecca FOSTER of Virginia.
On the 1840 census, there is not a joshua REEDER in Ohio. But a couple in other states, but not the right age. Possibly he died in the cholera epidemic that went through there.
My ancestor Jonathan MILLS married Phebe REEDER, dau of William REEDER and Elizabeth BEERS.
DNA testing has been done on my brother, a male MILLS. Have since found 5 other branches, at least by DNA, of our family.