A blood relationship is an interpersonal relationship formed on the basis of ancestry or a physical connection, or an interpersonal relationship formed on the basis of marriage and blood relationship. According to the above definitions, Which of the following relationships are related:. ['Zhang San was away on business and met a cousin from his hometown.', 'The first meeting of class 88 students from a Chinese university.', 'Xiao Zhang was sent to Japan to study by the company and met an old friend from Tokyo many years ago.', 'Li Tiemei sings in Beijing Opera "Red Lantern": "My cousin in my family is innumerable . Although he is a relative and does not recognize each other . but he is even closer than his relatives. ".']