[Pedro] lives with his daughter [Heather] and has not seen his father, [Harold] in over a year. [Robert] 'son [Allan] and [Allan]'s grandfather [Harold] went on a cruise together.
('Robert', 'Heather')
[Robert] 'son [Allan] and [Allan]'s grandfather [Harold] went on a cruise together. [Pedro] lives with his daughter [Heather] and has not seen his father, [Harold] in over a year.
[{('Robert', 'niece', 'Heather'): [('Robert', 'brother', 'Pedro'), ('Pedro', 'daughter', 'Heather')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'father', 'Harold'), ('Harold', 'son', 'Pedro')]}, {('Robert', 'father', 'Harold'): [('Robert', 'son', 'Allan'), ('Allan', 'grandfather', 'Harold')]}]
['son', 'grandfather', 'son', 'daughter']