I think you may have heard from another Adney descendant on some of the records I have found on Sarah Adney/Cottrill.I have her obituary as found in John R. Adney's records on microfiche at the LDS and can send copy to you if you want.
I have found nothing on her daughter, Nancy Cottrill. I only have one record on John Cottrill:
1880 US CENSUS, Mendon, Clayton, Iowa, FHL 1254333, Film No T9-0333, Page No 466A
S. J. CATTRILSelfM Fem W 52OHOHVA
John CATTRILSonSMaleW19WIFarm LaborerOHOH
Here is some information on Elias Perry Cottrill:
1900 US CENSUS, Illinois, Cook County, City of Chicago, Lake Township, Roll 284 Book 2, Page 161a, Sheet 8B:
PERRY, Elias C.Head, Born Feb 1857, Age 43, Marr 20 yrs., Born WI, Father VA, Mother OH, Occupation: Police
"Barbara C.Wife, Born Feb 1859, Age 41, 2 children/2 living, Born MO, Father VA, Mother VA.
"Clarence M. Son, Born Jul 1882, Age 17, Born MO
"Mabel E.Dau, Born Jun 1884, Age 15, Born KS
1910 US CENSUS, Minnesota, ST LOUIS, City of Duluth, 6th Pct., Roll 724 Book 2, Page 107a, Sheet 5A:
PERRY, Elias C. Head, Age 53, Marr 30 yrs., Born WI, Father OH, Mother OH. Occupation (unreadable)
"BarbaraWife, Age 50, 2 children / 2 living, Born MO, Father OH, Mother OH.
"Clarence M. Son, Age 28, single, Born MO.
Minnesota Historical Society - Death records:
PERRY, ELIAS COTTRILLCertID# 1936-MN-005377
Date of Death:02/03/1936County of Death:HENNEPIN
PERRY, BARBARACertID# 1947-MN-021453
Date of Death:06/08/1947County of Death:HENNEPIN
PERRY, CLARENCE M.CertID# 1951-MN-024221
Date of Death:12/20/1951County of Death:HENNEPIN
F.Y.I..... I am descended from Esther Caroline Adney who was Sarah Jane's sister.Doreen McMillen