When faced with brokenness in families it is tempting to confuse obedience to God’s precepts with obligating God by obedience to his precepts.
Richard Pratt writes about brokenness in families, which will be present everywhere because families are made up of imperfect people:
An excerpt:

In recent decades, Christian television has spread what many call the “prosperity gospel” — the misguided belief that if we have enough faith, God will heal our diseases and provide us with great financial blessings. Of course, most people reading this article scoff at the thought that faith can yield such benefits. But don’t laugh too hard. We have our own prosperity gospel for our families. We simply replace having enough faith with having enough obedience. We believe that we can lift our families out of their brokenness if we conform to God’s commands.
You’ve probably encountered this outlook at one time or another. Teachers and pastors tell wives that they will enjoy wonderful relationships with their husbands and children if they will become “an excellent wife” (Prov. 31:10). After all, Proverbs 31:28 says: “Her children rise up and bless her; her husband also, and he praises her.” At men’s conferences, fathers recommit themselves for the sake of their children because “the righteous who walks in his integrity — blessed are his children after him!” (Prov. 20:7). In much the same way, young parents are led to believe that the eternal destinies of their children depend on strict and consistent training. You know the verse: “Train up a child in the way he should go; even when he is old he will not depart from it” (Prov. 22:6). Passages like these have been taken as indicating that Christian families experience blessings and loss from God, quid pro quo. We believe that God promises a wonderful family life to those who obey His commands.
Now, we need to be clear here. The proverbs commend certain paths to family members because they reflect the ways God ordinarily distributes His blessings. But ordinarily does not mean necessarily. Excellent wives have good reason to expect honor from their husbands and children. Fathers with integrity often enjoy seeing God’s blessings on their children. Parents who train their children in the fear of the Lord follow the path that frequently brings children to saving faith. But excellent wives, faithful husbands, and conscientious parents often endure terrible hardship in their homes because proverbs are not promises. They are adages that direct us toward general principles that must be applied carefully in a fallen world where life is always somewhat out of kilter. As the books of Job and Ecclesiastes illustrate so vividly, we misconstrue the Word of God when we treat proverbs as if they were divine promises.
Quite often, there are correlations between obedience and blessings, as well as between disobedience and loss. But never be fooled into thinking you are able to figure out what God will do next in someone’s family.

Read the whole article at Keylife (who have sourced it from Ligonier)