[James] took his son [Mark] out for ice cream. [Mark] took his sister [Glenna] out to lunch after learning that she got accepted into her first choice for university. [Michelle] took her grandson [Mark] to the zoo.
[Mark] took his sister [Glenna] out to lunch after learning that she got accepted into her first choice for university. [Michelle] took her grandson [Mark] to the zoo.
[{('Glenna', 'grandmother', 'Michelle'): [('Glenna', 'brother', 'Mark'), ('Mark', 'grandmother', 'Michelle')]}]