Sometimes we use the terms peace and prayer to cover up our problems and run away from the reality we ought to address. In as much as praying is quite important, ignoring to deal with the reality would be more dangerous. In Mat 7:21, “Not everyone who calls me Lord! Lord! Will enter the kingdom.”
We tend to at times to give God problems that He is not part of. As a father, you are not obliged to address every issue in your son’s marriage. You only guide where necessary. Just in the same way, when a car you are driving loses a wheel, a good driver does not sit back praying to God to help him.