If you witness a child cursing their mother, you should consider the specific context and your relationship to the situation before taking action. In many cultures, disrespecting parents is seen as a serious offense, and historical and religious texts often prescribe severe consequences, but modern approaches focus on safety and de-escalation. Depending on the circumstances, your best course of action might be to remove the child from the immediate area, speak to the parent or other authority figure, or simply move on.