[Margaret]'s son [Mark] is turning nine today, so she is throwing him a party. [Margaret] bought her mother, [Emily], a puppy for her birthday. [Mark] and his son [Marvin] went to look at cars. [Mark] ended up buying the Mustang.
[Mark] and his son [Marvin] went to look at cars. [Mark] ended up buying the Mustang. [Margaret]'s son [Mark] is turning nine today, so she is throwing him a party. [Margaret] bought her mother, [Emily], a puppy for her birthday.
[{('Marvin', 'mother', 'Emily'): [('Marvin', 'son', 'Mark'), ('Mark', 'grandmother', 'Emily')]}, {('Mark', 'grandmother', 'Emily'): [('Mark', 'mother', 'Margaret'), ('Margaret', 'mother', 'Emily')]}]