en_tn/pro/13/22.md

his grandchildren

"the sons of his sons" or "the children of his children" or "his descendants"

a sinner's wealth is stored up for the righteous person

This can be stated in active form. Alternate translation: "the one who does right will receive the wealth that a sinner has stored up" (See: rc://en/ta/man/translate/figs-activepassive)