From Eugene Peterson’s broad view of family in Psalm 128. “The illustration is, as we would expect, conditioned by Hebrew culture, in which the standard signs of happiness were a wife who had many children and children who gathered and grew around the table: fruitful vine and olive soots. This illustration is just that, an example that we need not reproduce exactly in order to experience blessing. (We, for instance, don’t try to have as many children as possible-or try to get them to stay home for all their lives!) But the meaning is still with us: Blessing has inherent in it the power to increase.”
Blessing being inherent is the character of God, belonging to His nature. And His power is in each blessing, maintaining the ability to increase the blessing and spill into the live of others, whether we have children or not and whether our children are able to live on their own or not.
You are blessed to be a blessing regardless of your earthly family situation.