William Stoneback, Easton, Northampton, PA

I am trying to find info about William Stoneback b. abt 1867 Easton, PA, he married Sarah "Sallie" Bunstein, she was b. 7 Feb 1869 Williams Twp. In the 1910 Census for Pennsylvania he is age 43, Head of Household with his son Earl b. abt 1889 and daughter Elizabeth age 9 b. abt 1901, but Sarah "Sallie" isn't listed with them.I am presuming she died before the census, maybe even in childbirth. Would anyone have any info on this family? Would like to find his parents and siblings and what happened to him and Sarah and their family.
Thanks
Tanya