[Regina] went to visit his grandmother, [Mary], at the nursing home. She was grateful for the company, she had n't had a family visit in months. [Thomas] and his sister [Regina] went to the park.
('Thomas', 'Mary')
[Thomas] and his sister [Regina] went to the park. [Regina] went to visit his grandmother, [Mary], at the nursing home. She was grateful for the company, she had n't had a family visit in months.
[{('Thomas', 'grandmother', 'Mary'): [('Thomas', 'sister', 'Regina'), ('Regina', 'grandmother', 'Mary')]}]