Family migration refers to the one-way flow of population in which family members follow the main production factors and move away from their original place of residence to the target place. According to the above definitions, Which of the following are family migrations:. ['Due to work transfer, Xiao Wang and his family moved to work city.', 'Lao Li and his wife work in coastal cities all year round. Only during the Spring Festival can they return to their hometown and reunite with their parents and children.', 'The old Zhang family ended their years of working outside the home and settled back to their hometown. After living for a while, they found that their hometown is very suitable for farming.', 'After the death of his wife, Lao Liu was received by a local elderly care institution in his old age in Macao.']