The Town House, The House at Old Vine, and The House at Sunset. It's a bit of a different take on the family saga idea, in that it's actually the story of a house over a period of about 900 years. Three books in all. Each one contains several different stories in it. What I love so much about the way Norah Lofts constructed it, was that each section is narrated by someone, and sometimes, you get one person telling his or her story about what happened when young, and then the next one is told from the point of view of someone who only knew that first person as an old man or woman, and so you get two very, very different versions of things.
Norah Lofts is simply one of my all time favorite novelists. There's also a two-part one that is likewise not exactly a standard kind of family saga, but excellent. Those books are titled Gad's Hall and The Haunting of Gad's Hall. Twentieth century people buy a lovely old home somewhere in England, and get the sense that it's haunted. Then the story flips back over a hundred years to the 1840's. the people that lived in the house then, and what happened to them. At the end, the story comes back to the present. Very, very good.
She also wrote a novel about the Donner Party, which I think was just about her very first novel.
My current copies of the above two series are old enough that they are getting ready to fall apart. I should go on line and see if I can get better copies.
I was quite sorry when she died, because she'd been writing a book a year (and I kind of think she may have published under other names) and it was a loss to not have anything new from her.