Richard: How do the years of birth for the Stephen and Hannah you refer to compare with the years of birth given for my newly mentioned Stephen and Hannah. I think we are comparing two different families.I've seen the census listings for a Stephen in Oakland County in both the 1840 and the 1850 census. The latter census also lists another Stephen Hungerford in Hillsdale county. He's now my prime candidate as Sarah's father. Although several records give Sarah's year of birth as 1828 (even her obituary), she stated her age was 18 for the 1850 census. That would make her actual birth year 1832.
Sarah's 1908 obituary mentions that she came to Michigan at age 7 with her parents. That would make the year of travel about 1839.