[Mary] loves when her daughter, [Martha], comes to visit. Sometimes [Martha] brings along her son, [Brent].
('Mary', 'Brent')
[Mary] loves when her daughter, [Martha], comes to visit. Sometimes [Martha] brings along her son, [Brent].
[{('Mary', 'grandson', 'Brent'): [('Mary', 'daughter', 'Martha'), ('Martha', 'son', 'Brent')]}]