A Tangled Web by L. M. Montgomery

Over the years sixty members of the Dark family and sixty Penhallows have married one another -- but not without their share of fighting and feuding. Now Aunt Becky, the eccentric old matriarch of the clan, has bequeathed her prized possession: a legendary heirloom jug. But the name of the jug's new owner will not be revealed for one year. In the next twelve months beautiful Gay Penhallow's handsome fiance Noel Gibson leaves her for sly and seductive Nan Penhallow; reckless Peter Penhallow and lovely Donna Dark, who have hated each other since childhood, are inexplicably brought together by the jug; Hugh and Joscelyn Dark, separated on their wedding night ten years ago for reasons never revealed, find a second chance -- all watched over by the mysterious Moon Man, who has the gift of second sight. Then comes the night when Aunt Becky's wishes will be revealed...and the family is in for the biggest surprise of all.

There was nothing Aunt Becky liked better than a family get-together.
Such an occasion was sure to offer her plenty of opportunity to tease, insult and humiliate the assembled members of her clan, and Aunt Becky was very fond of doing just that.

This particular clan gathering, however, promised to be even more eventful than usual, because Aunt Becky was going to make a very important announcement. . .

What happened at the party, and (even more important) what happened because of it, is described by L. M. Montgomery at her humorous best.