How to help children and adolescents manage tension?

The welfare of a child is not to be measured by money only, nor by physical comfort only.

Train them to virtue; habituate them to industry, activity, and spirit. Make them consider every vice as shameful and unmanly. Fire them with ambition to be useful. Make them disdain to be destitute of any useful knowledge. Fix their ambition upon great and solid objects, and their contempt upon little, frivolous, and useless ones.

The first duty towards children is to make them happy. If you have not made them so, you have wronged them. No other good they may get can make up for that.