[Natalia] has a sister named [Jennifer] and a brother named [Dennis].
('Natalia', 'Jennifer')
[Natalia] has a sister named [Jennifer] and a brother named [Dennis].
[{('Natalia', 'sister', 'Jennifer'): [('Natalia', 'brother', 'Dennis'), ('Dennis', 'sister', 'Jennifer')]}]
['brother', 'sister']