[Milton] took his brother [Glen] to Las Vegas to go gambling. [Glen]'s mother [Amy] wanted to surprise him for his birthday, so she baked him a cake.
('Milton', 'Amy')
[Milton] took his brother [Glen] to Las Vegas to go gambling. [Glen]'s mother [Amy] wanted to surprise him for his birthday, so she baked him a cake.
[{('Milton', 'mother', 'Amy'): [('Milton', 'brother', 'Glen'), ('Glen', 'mother', 'Amy')]}]
['brother', 'mother']