Albert Barnes Commentary Psalms 112:2

"His seed shall be mighty upon earth: The generation of the upright shall be blessed." — Psalms 112:2 (ASV)

His seed shall be mighty upon earth – His children; his posterity. That is, they will be prosperous, honored, and distinguished among people: distinguished for their virtues, their influence, and their success in life. This refers to what was regarded among the Hebrews as an object of great desire and is in accordance with the promises found everywhere in their Scriptures. See Psalm 25:13, note; Psalms 37:25–26, notes. Compare Genesis 12:2; Genesis 17:6; Exodus 20:6.

It is also in accordance with a general fact in the course of events. The best security for the virtue and success of children is the virtue and piety of parents; the surest inheritance pertaining to happiness, respectability, and usefulness in life is that which is derived from the example, the prayers, and the counsel of a pious father and mother.

The generation of the upright shall be blessed – The family; the children. Such promises are expected to be fulfilled generally; proper rules of interpreting language do not require that this is universally and always true.