William and Sarah are married.
William is Tom's father . Sarah is Tom's mother .
Tom and Sam are the sons of William and Sarah.
Jenny and Pamela are the daughters of William and Sarah.
Roberta is Tom's wife and Tom is Roberta's husband .
Roberta is the sister-in-law of Jenny, Pamela and Sam.
Miriam is the sister-in-law of Jenny, Tom and Pamela.
Sam is Roberta's brother-in-law .
Roberta is the daughter-in-law of William and Sarah.
Sarah is Roberta's mother-in-law .
William is Roberta's father-in-law .