The 1900 census for Cooper & Pleasant Valley Townships, Webster Co, IA: CAMPBELL, Richard b. 1837 in Ireland, married 23 yrs, both parents b. Ireland, immigrated 1845, occ: R.R. laborer wife Bridget b. Feb 1850 in Ireland, 7 children born, 7 children living, both parents b. Ireland, immigrated 1870 son Hugh b. Sept 1878 in IA son Richard b. June 1881 in IA son Thomas b. Apr 1883 in IA son James b. Apr 1885 in IA son Bernard b. Aug 1888 in IA son Stephen b. Aug 1892 in IA grandson GRINNAN, Thomas b. Feb 1894 in IA, father b. WI, mother b. IA granddau GRINNAN, Lizzie b. Jan 1895 in IA
In 1910 the two grandchildren's surname is listed as DRENNAN.
In 1880 they are in Lincoln, Worth Co, IA, Richard age 35, Brigett, age 25, dau. Mary, age 5 and son Hugh, age 1.
There's a marriage record for Stephen CAMPBELL, age 22, born Ft. Dodge, IA, to Maude UPTON, age 19, born Boone Co, IA, on 6-June-1914 in Boone Co. Groom's parents were Richard CAMPBELL and Bridget MCNICKLOS.Bride's parents were Charles UPTON and Ann FLAUREY.
There's a marriage record for Richard CAMPBELL to Bridget MC NICHOLAS JAMISON on 21-Oct-1877 in Bremer, IA.Bride's father's name MC NICHOLAS, bride's previous husband was Thomas JAMISON.This marriage date fits with the number of years married listed in the 1900 census.
There's a marriage record for Bridget MCNICHOLS to Thomas JIMERSON on 17-Feb-1974 in Greene, Butler Co, IA.
There are two marriage records for Mary, daughter of Thomas JAMESON and Bridget MCNICHOLDS.She married John TIERNEY on 13-Apr-1898 in Fort Dodge, Webster Co, IA.She was already known as Mary GRENNAN at that marriage, so there must have been a previous marriage that produced the two grandchildren listed in 1900, but I do not see a record for it.She married for a third time to Michael O'SULLIVAN on 21-June-1922, same location.
There's an IA death record for Richard and Bridget's son Bernard, which spells her maiden name as MCNICHOLIS.