[Keith] is [Harry]'s Brother. [Keith] and his sister [Donna] are going for a walk. [Donna] went on a vacation with her brother [Tom].
('Harry', 'Tom')
[Keith] is [Harry]'s Brother. [Keith] and his sister [Donna] are going for a walk. [Donna] went on a vacation with her brother [Tom].
[{('Harry', 'brother', 'Tom'): [('Harry', 'brother', 'Keith'), ('Keith', 'brother', 'Tom')]}, {('Keith', 'brother', 'Tom'): [('Keith', 'sister', 'Donna'), ('Donna', 'brother', 'Tom')]}]