Phineas Wolcott Cook was born 25 August 1819 in Goshen, Litchfield County, Connecticut, United States to Phineas Cook (1787-1848) and Irene Churchill (1786-1870) and died 24 July 1900 Afton, Lincoln County, Wyoming, United States of unspecified causes. He married Ann Eliza Howland (1823-1896) 1 January 1840 in Richland, Kalamazoo County, Michigan, United States. He married Amanda Polly Savage (1836-1915) 18 December 1853 in Salt Lake City, Salt Lake County, Utah, United States. He married Catherine McCleve (1836-1869) 18 December 1853 in Salt Lake City, Salt Lake County, Utah, United States. He married Johanna Christina Palsson (1845-1929) 13 September 1878 in Salt Lake City, Salt Lake County, Utah, United States.
Children
| Name | Birth | Death | Joined with |
| Charlotte Aurelia Cook (1841-1847) | |||
| Harriet Betsy Cook (1844-1933) | |||
| Eliza Hall Cook (1846-1847) | |||
| Augusta Prisconda Cook (1848-1867) | |||
| Phoebe Irene Cook (1852-1913) | 9 January 1852 Manti, Sanpete County, Utah, United States | 18 April 1913 Salt Lake City, Salt Lake County, Utah, United States | ฺByron Harvey Allred (1847-1912) |
| Alonzo Howland Cook (1855-1933) | |||
| Henry Howland Cook (1859-1933) | |||
| Name | Birth | Death | Joined with |
| David Savage Cook (1858-1924) | |||
| Mary Rosalie Cook (1863-1945) | |||
| Name | Birth | Death | Joined with |
| Joseph Wolcott Cook (1855-1931) | |||
| Name | Birth | Death | Joined with |
| Moses Cook (1880-1970) | |||
| Kib Phineas Cook (1882-1934) | |||
| Parley Abraham Cook (1886-1960) | |||
| Idalia Johanna Cook (1889-1985) | |||
Siblings