[Michelle]'s brother [Allan] and sister [Elsie] helped buy a gift for [Allan]'s father [Robert]. [Ronald]'s wife, [Elsie], planned a surprise visit to her friends
('Ronald', 'Robert')
[Ronald]'s wife, [Elsie], planned a surprise visit to her friends [Michelle]'s brother [Allan] and sister [Elsie] helped buy a gift for [Allan]'s father [Robert].
[{('Ronald', 'father-in-law', 'Robert'): [('Ronald', 'wife', 'Elsie'), ('Elsie', 'father', 'Robert')]}, {('Elsie', 'father', 'Robert'): [('Elsie', 'brother', 'Allan'), ('Allan', 'father', 'Robert')]}, {('Elsie', 'brother', 'Allan'): [('Elsie', 'sister', 'Michelle'), ('Michelle', 'brother', 'Allan')]}]
['wife', 'sister', 'brother', 'father']