A nuclear family is a family of two generations, a couple and their children, who usually do not live with other relatives. According to the above definition, Which of the following belong to the nuclear family:. ["Ms. Zhang's mother died early. When she saw her father was living alone, she took him to her home and lived together so that she could take care of her father in all aspects.", 'Mr. Wang and Mrs. Wang are busy with their careers. Both parents are not around. The only son is studying high school. No one in the family usually does housework. They have to hire a part-time worker to take care of their daily life.', 'Manager Li\'s family is strong. Although his son has married his daughter-in-law, he still lives with them. Manager Li is also happy that they continue to be "old. ".', "After Mrs. Liu's only daughter got married, Mrs. Liu lived with her husband; after her husband died, he passed away by himself and did not want to live with his daughter-in-law."]