It is a long and complicated process to cultivate the sense of unity and mutual assistance of many children in the family, which requires parents to guide and cultivate in many ways.

Here are some suggestions:

1. Establish family values: Family values refer to the code of conduct, beliefs and culture recognized by a family. Establishing positive family values in the family will help children form a sense of mutual care and help.

2. Cultivate the spirit of sharing: Encouraging children to share their toys, books and food at home can help children learn to care about and take care of the needs and feelings of others, thus cultivating the sense of unity and mutual assistance.

3. Encourage cooperation: In the family, parents can encourage their children to complete some housework, study tasks or games together, and cultivate their cooperative spirit and team consciousness.

4. Establish family rules: Establish family rules, such as taking turns doing housework, respecting others and sharing things. It will help children form common norms, thus reducing quarrels and disputes and promoting family harmony.

5. Create a common experience: In the family, parents can arrange some family activities, such as going out together, watching movies and doing handicrafts. Let the children experience the joy of unity and cooperation together.

6. Conflict resolution education: It is inevitable that there will be quarrels and conflicts between multiple children in the family. Parents should educate their children to solve conflicts through communication, compromise, understanding and tolerance, and avoid vicious competition and comparison.

Finally, to cultivate the consciousness of unity and mutual assistance among many children in the family requires the long-term guidance and subtle influence of parents, so that children can grow and develop in a healthy and harmonious family atmosphere.