[Arthur] and his brother [Guy] are looking for a good gift for [Guy]'s mother [Lois].
('Lois', 'Arthur')
[Arthur] and his brother [Guy] are looking for a good gift for [Guy]'s mother [Lois].
[{('Lois', 'son', 'Arthur'): [('Lois', 'son', 'Guy'), ('Guy', 'brother', 'Arthur')]}]