Children ... married - The twofold relationship gives a double certainty of acceptance. As children, they were sure of a father’s love, as a wife they might hope for a revival of past affection from the husband of their youth.
One of a city, and two of a family - The family (in Hebrew) is far larger than a city, as it embraces all the descendants of a common ancestor. Thus, the tribe of Judah was divided into only four or five families. However national the apostasy, it does not involve in its guilt the few who are faithful, and the promises are still their rightful possession.
To Zion - To the true Church. The fulfillment of the promise began with the return to Palestine after the Babylonian exile, but is complete only in Christianity.