What should I do if any minor faces damage claim?

My teenage son, aged 16, was driving a 4-wheeler and was involved in a minor accident. His car touched a biker who was riding pillion with his wife and 7-year-old son on an Activa. They fell down and sustained minor injuries. I got them admitted to the hospital, where the wife and son were discharged the same day, but the rider sustained a fracture and had to undergo an operation. However, he too was discharged in a few days. The rider and his family are now fine, but they have filed a case against my son and are claiming 1 lakh as damages. What should I do?