Set on Lake Ontario it chronicles the Whiteoak family for approximately 100 years IIRC. Made into a miniseries some years ago but I never saw that sadly.
Here's a bit.....
http://en.wikipedia.org/wiki/Mazo_de_la_Roche
Her books became best-sellers and she wrote 16 novels in the series known as the Jalna series or the Whiteoak Chronicles. The series tells the story of one hundred years of the Whiteoak family covering from 1854 to 1954. The novels were not written in sequential order, however, and each can be read as an independent story.
It is interesting to note the similarities and differences in the experiences of the Whiteoak family and de la Roche's. While the lives and successes of the Whiteoaks rise and fall, there remained for them the steadiness of the family manor, known as Jalna. De la Roche's family endured the illness of her mother, the perpetual job searches of her father, and the adoption of her orphaned cousin while being moved 17 times. Her family did work a farm for a few years for a wealthy man who owned the farm for a hobby. Several critics believe that Finch Whiteoak who majors in Finch's Fortune (1932) is a reflection of de la Roche herself. He was a somewhat tortured concert pianist with overtones of gayness.[3] The names of many of the characters were taken from gravestones in a Newmarket, Ontario cemetery.
The Jalna series has sold more than eleven million copies in 193 English and 92 foreign editions. In 1935, the film Jalna, based on the novel, was released by RKO Radio Pictures and, in 1972, a CBC television series was produced based on the series.