[Leonard] is in the same grade as his sister [Natasha], but his sister [Anna] is 2 years ahead of him. [Anna] gave her brother [Richard] a new sweater for Christmas.
('Natasha', 'Richard')
[Leonard] is in the same grade as his sister [Natasha], but his sister [Anna] is 2 years ahead of him. [Anna] gave her brother [Richard] a new sweater for Christmas.
[{('Natasha', 'brother', 'Richard'): [('Natasha', 'brother', 'Leonard'), ('Leonard', 'brother', 'Richard')]}, {('Leonard', 'brother', 'Richard'): [('Leonard', 'sister', 'Anna'), ('Anna', 'brother', 'Richard')]}]
['brother', 'sister', 'brother']