Re: Keiffer / Kieffer Lock Haven CLinton County, Pa
Samuel appears in the 1860 census, Woodward, Clinton county, as Keffer.
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In 1870 (Keifer) he has acquired a wife an two kids, Annie and Robert, but it looks like Annie (age 11) was Sarah's child.
In 1880 (Keefer) Frederick is 4 and Sallie (Sarah Ellen) is 11 months.
So, your Fred most certainly is his son.
Sarah Ellen married William Mayer Probst on 12/12/1896.
The Jacob you mentioned was a son of John and Catherine of Switzerland.