[Frances] picked up her daughter [Lena] from school early. [Joshua] asked his sister [Lena] if she could pick his son [Don] up from school today and she said yes.
('Don', 'Frances')
[Joshua] asked his sister [Lena] if she could pick his son [Don] up from school today and she said yes. [Frances] picked up her daughter [Lena] from school early.
[{('Don', 'grandmother', 'Frances'): [('Don', 'father', 'Joshua'), ('Joshua', 'mother', 'Frances')]}, {('Joshua', 'mother', 'Frances'): [('Joshua', 'sister', 'Lena'), ('Lena', 'mother', 'Frances')]}]
['father', 'sister', 'mother']