Both women are related to Emma Thompson, who is Sophie's older sister.
Emma played Elinor Dashwood in Sense and Sensibility, 1996. Sophie also played Mary Musgrove in Persuasion, 1995. Update: Most recently, Phyllida played Cassandra Leigh Austen, Jane's mother, in Miss Austen Regrets. (See picnic photo)
More about Phyllida and her daughters:
- Phyllida Law: New York Times Biography
- Actors' Wedding Photo Donated: Bristol University