[Margaret] went to her brother [William]'s birthday party [William] took his son [Samuel] to play at the park, and [Samuel]'s paternal grandmother [Emily] tagged along.
[Margaret] went to her brother [William]'s birthday party [William] took his son [Samuel] to play at the park, and [Samuel]'s paternal grandmother [Emily] tagged along.
[{('Margaret', 'mother', 'Emily'): [('Margaret', 'brother', 'William'), ('William', 'mother', 'Emily')]}, {('William', 'mother', 'Emily'): [('William', 'son', 'Samuel'), ('Samuel', 'grandmother', 'Emily')]}]