[Dorothy] bought a Valentines day gift for her husband [Pedro] and also got him a card. [Harold] invited his daughter [Tracy] to bring her son [Kevin] and his uncle [Pedro] for a visit.
('Dorothy', 'Harold')
[Dorothy] bought a Valentines day gift for her husband [Pedro] and also got him a card. [Harold] invited his daughter [Tracy] to bring her son [Kevin] and his uncle [Pedro] for a visit.
[{('Dorothy', 'father-in-law', 'Harold'): [('Dorothy', 'husband', 'Pedro'), ('Pedro', 'father', 'Harold')]}, {('Pedro', 'father', 'Harold'): [('Pedro', 'sister', 'Tracy'), ('Tracy', 'father', 'Harold')]}, {('Tracy', 'father', 'Harold'): [('Tracy', 'son', 'Kevin'), ('Kevin', 'grandfather', 'Harold')]}]
['husband', 'sister', 'son', 'grandfather']