I'm not quite sure why, it may be because I enjoyed reading Family History so much the day before, but I didn't enjoy Ordinary Families very much.
The premise was that many families are Ordinary but family life is interesting; however, I'm not sure that I really found this so in Robertson's book. It was a very descriptive novel dealing with the coming of age of Lallie, a member of one of a number of families in the book who go sailing and enjoy the outdoorsy life available to the upper middle classes in the 1930s.
Maybe I will have better luck with the other VMC by Robertson that I own, the intriguingly entitled Four Frightened People. She has written a number of other novels of which only one more is published as a VMC, Cullum.