Hi Shellyesq, thanks for the reply.
I do know of William's first marriage in 1903, and she (Bertha) was back with parents on 1910 census, saying she is single, which I suppose was correct if divorced.
Meanwhile, a quick breakdown of Mary's life as I know it:
Mary Jane Dobson, born 24 Feb 1873 in Blackburn, Lancashire
Emigrated to Canada with mother – after 1876, with 1900 census indicating 1878
1892, marries Bertram Foster Chase in Hudson, New Hampshire
1893, son Arthur is born and dies
1894, son Harold is born
1895, daughter Edith is born, she dies in 1896.
1900, Mary Jane is enumerated as Servant in the Goodwin residence, Abbott St, Nashua, Hillsborough. Married 7 years, with one child. However, son Harold Bertram Chase is with the Wright family in Merrimack, as nephew. Husband Bertram is in Middlesex, Vermont. On his own and says single, and a farmer.
1905. Bertram marries Juliette Wheeler (a widow, maiden name Carpenter)
1909. Mary and William Smith marry in Lynn City, and this is where they are in 1910 census.
1910. Mary and Bertram’s son Harold is still with the Wright family, this time as Adopted son.
1914. Harold marries
1915. Bertram dies and is buried in North Branch Cemetery, Middlesex, Vermont
1923. Mary Jane Smith dies.