How do children use adult social security cards?

You can't. Take Jiangsu Province as an example: Article 4 of the Regulations on Handling Services of Social Security Card Business in Jiangsu Province (Trial) stipulates that "one person, one number and one card" shall be implemented for social insurance cards throughout the province; Article 31 stipulates that cardholders may not lend their social security cards to others for use.

skill

The above answer is only for the current information combined with my understanding of the law, please refer carefully!

If you still have questions about this issue, I suggest you sort out relevant information and communicate with professionals in detail.