General filling methods are: paternal daughter (son), maternal daughter (son), brother and sister, brother and sister. Main social relations of the family: mainly refers to the close relatives and friends who have great influence on me, including grandparents, uncles and aunts, uncles and aunts, etc.

Precautions for students returning to school:

1. Do daily self-health monitoring according to the requirements of the school. When you are absent due to illness, you need to take the initiative to explain the reasons and medical conditions.

2. Students should actively learn the knowledge of prevention and protection in COVID-19, and take some scientific and appropriate protective measures.

3. Prepare masks, paper towels, disinfectant wipes or hands-free disinfectants in the schoolbag.

4. Students give priority to their parents' private cars, or walk or ride bicycles to and from school. If you take public transport, you should always wear a mask to avoid contact with public goods.

5. Wear masks in classrooms and crowded places.

6. Develop good hygiene habits, wash your hands frequently, avoid dirty hands touching your mouth, eyes and nose, and cover your mouth and nose with paper towels or elbows when coughing.