Isabelle was the daughter of John and Dorcas (Campbell) Whiteaker. She married John Douglass on March 29, 1855, at the home of John Whiteaker in Knox County, Missouri. They farmed near Utica in Van Buren County, Iowa. John and Isabelle had three sons: Charles, Edgar, and J. William. John Douglass was killed in action during the Civil War in 1862 in the Battle at Prairie Grove, Arkansas. On Mar. 21, 1866, Isabelle was married to Granville M. Goings in Knox County, Missouri. On March 7, 1871, Isabelle was married to John H. Allen. They had one son, Thomas F. Allen, and also adopted one daughter, Alice West. On Nov. 13, 1898, Isabelle married her last husband, James Grubb, in Scotland County, Missouri.


Obituary from The Memphis Reveille ©
Mar. 23, 1911, P. 2:

The congregation at the M. E. Church was greatly shocked when Bro. Lane announced that he would preach the funeral of Mrs. Grubb, Wednesday at this place as we had not learned of her sickness. She died at the home of her son, Charles Douglas, in Kirksville. Her home had been in Arbela for the last twelve years. Aunt Belle, as we all called her, through the love we had for this dear old lady, was always ready to care for the sick and speak words of cheer and comfort to us when death visited our homes. The church and ladies aid society has lost a loyal member but our loss is her gain. She was 73 years, 11 months, and 7 days of age. She leaves to mourn her death four sons--Charles Douglas, Edgar Douglas and Thomas Allen of Kirksville, and William Douglas of Rutledge, also two stepchildren, Scott Grubb and Martha Tennant of Arbela. Funeral services were held at the M. E. Church, Wednesday, at 12 o'clock, Rev. Lane officiating, after which the remains were taken to Hickory Grove cemetey and laid to rest beside her last husband, James Grubb. We extend our sympathy to her bereaved children.