I just found Benjamin and Roby Douglass' daughter Rosetta. I was looking for death information on Benjamin and Roby, and found that Roby had sold their land in Jefferson county in 1882, and the deed showed that she was living in Columbus, Cherokee Co., KS!
Their daughter Rosetta was living in Cherokee Co., too. She appears to have married George E Beers/Bears about 1869, as her first child was born in Kansas in 1870. George was the son of Harvey R Beers. The Beers family was recorded twice in the 1860 census, once in Farmington and once in Aztalan in Jefferson Co.
H R Beers 35 NY Merchant
Ann 35 PA
George 11 PA
Frank 7 PA
Margaret Rowley 19PA
Chas D Graham 25 MA (married Dora Douglas)
P H Lawrence 25 VT
T B Banks 35 NY
C M Taylor 23 NY
I had not been able to find Rosetta because she was always listed as "Etta" in the censuses.
I found Roby Douglass in the Columbus City Cemetery:
b. 27 Oct 1812
d. 17 Jul 1901 88 yrs
The Cherokee Co. death record showed only that she died of senelity.
I didn't find a grave for Benjamin Douglass, but the local historical society had an obituary index that indicated he died on 5 Feb 1881.
Even though Roby lived into 1901, I was not able to find her in the 1900 census. Perhaps she had been visiting one of her other children. I will keep looking.
Rosetta and George Beers/Bears had two children:
Fred b. 31 Jan 1870
Grace b. 1883-5 m. Clarence Broadway