Hello, I have recently learned that Isaiah Thomas's farm was indeed next to "Thomas Road", which is just West of Graton. Following is a list of their children & their marriages, which is posted in the hope it will attract people who have more knowledge of the lives and times of these interesting people:
Eudora Thomas, 1849-1850
Zachariah Thomas, 1851-1905, married Mary Jane Leffingwell(1841-1936) on 8/2/1874 in Sonoma Co.
Samuel Martin Thomas, 1853-1928, married Gertrude Wiley(abt 1860-?) on 10/29/1878 in Sonoma Co.
Sarah Ann Thomas, 1855-1936, married John Valentine Davis(1845-1929)on 3/29/1874 in Sonoma County; the son of Levi Davis & Rebecca Lakey
Mary Ellen Thomas, 1856-1909, married Franklin Rambo(1840-abt 1895) in Sonoma County; the son of Adonijah Rambo & Nancy Montgomery
Isaac Richard Thomas, 1859-1923, married Anna Phinney(abt 1865-?) on 2/8/1883 in Sonoma County
John Elton Thomas, 1861-1905, married Elsie Cheney(?-?) on 10/9/1898 in Sonoma County
Alfred Ross Thomas, 1866-1945, married Lydia P Williamson(1874-1953) on 12/22/1892 in Sonoma County; the dau of Richard Williamson & Nancy Graves
Jacob Harvey Thomas, 1868-?, married Charlotte I. Marshall(abt 1868-?) on 6/29/1895 in Sonoma County; the dau of Henry Marshall & ?
Matilda F Thomas, 1870-?, married Fredrick Williamson(1867-1953) on 1/15/1891 in Sonoma County; the son of Richard Williamson & Nancy Graves
Henry Rambo Thomas, 1873-?, married Effie V Bonham(1876-1969) on 11/1899 in Sonoma County; the dau of David W Bonham & Margaret Davis
Arminta R Thomas, 1875-1915, married William Churchman(1872-1917) on 12/22/1898 in Sonoma County; the son of Schuyler Churchman & Eliza Wilson
Would greatly appreciate any details that can be added.