"Every time God spoke during creation, order came out of the chaos." (Thomas Madden at Life Church Huntsville over a year ago.)
This applies to our lives as well, even the lives of the families with prodigals.
He also said, "Speak prophetically the word of the Lord."
Then he talked about how satan is not omniscient. He does NOT know everything. ("But we speak the wisdom of God in a mystery, the hidden wisdom which God ordained before the ages for our glory, which none of the rulers of this age knew; for had they known, they would not have crucified the Lord of glory." -- 1 Corinthians 2:7-8)
He said, "All that satan is doing in my life is a set up by God for His will to be done, for the glory to be revealed." That is powerful, especially for those families with prodigals.
Then he gave some direction: "We have to roll the stone away and move into spiritual warfare. We are the ones who rolled the stone over the situation and decided to just cope."
So. . . roll the stone away; move into spiritual warfare; speak prophetically the word of the Lord; and NEVER believe satan's lies.