Albert Barnes Commentary Psalms 96:7

"Ascribe unto Jehovah, ye kindreds of the peoples, Ascribe unto Jehovah glory and strength." — Psalms 96:7 (ASV)

Give unto the Lord - Ascribe to the Lord—to Yahweh. This is extracted literally from 1 Chronicles 16:28.

O ye kindreds of the people - Hebrew, “Families” of the people: people, as united by family ties. The idea is that of worship not merely as individuals, nor as a mere aggregate of individuals united by no common bonds, but as those united by strong ties, bound by blood and affection, and constituted into communities. It is a call on such to worship God in their capacity as they are thus bound together; to come as families and to worship God.

In other words, it is a call on families “as such” to acknowledge God. A family is a proper place to honor God. When the same joy pervades all hearts in prosperity, and when all are alike made sorrowful in adversity, it is evidently fitting that all should unite in the same worship of God; and that, as in all other things they have common interests, sympathies, and affections, so they should also have them in religion—in the service of their Creator.

Give unto the Lord glory and strength - That is, proclaim that these belong to God, or worship Him as a God of glory and power.