Fake Ancestor? REAL ONE's Back Now!

Sabrina Randolph is married to the only grandson of another house, a man who is dying, on the understanding that the marriage will turn his luck and keep him alive. Her stepmother arranged it and took the money for it. The Randolphs have never had much use for Sabrina, who is the eldest daughter of the family. The soul in her is a diviner who read the heavens for an imperial court a thousand years ago, which nobody in either house knows. She can see what is actually wrong with her husband. The family's adopted son has put a curse on him that pulls a man's life and luck across to whoever cast it, and the money follows. While she is working the curse loose, the adopted son gets the wrong end of it and settles on Sabrina's half-sister as the ancestor his sect has spent a long time looking for. At a banquet at her husband's house, the half-sister uses the standing that comes with that name to go at Sabrina in front of the guests.