[Matthew] went with his sister [Katherine] to get groceries and [Katherine]'s sister [Michelle] went with them. [Michelle] went shopping with her son. His name is [Tom].
('Tom', 'Matthew')
[Michelle] went shopping with her son. His name is [Tom]. [Matthew] went with his sister [Katherine] to get groceries and [Katherine]'s sister [Michelle] went with them.
[{('Tom', 'uncle', 'Matthew'): [('Tom', 'mother', 'Michelle'), ('Michelle', 'brother', 'Matthew')]}, {('Michelle', 'brother', 'Matthew'): [('Michelle', 'sister', 'Katherine'), ('Katherine', 'brother', 'Matthew')]}]