Hmmm. Doesn't that highlight the need for a parent to be Christ-like, gracious, loving, understanding and compassionate to the children? We sacrifice those attributes too often so we can be firm, preventative and corrective. Behavior is emphasized over faith. We have a better chance of getting it right when we become a grandparent.
When the Lord personally addressed one of His followers about something didn't He usually highlight a lack of faith?
A dear friend alienated one of his daughters and damaged his relationship with the other by his reaction to what was wrong with their character when they were younger. Now that he is a grandparent, he was able to pour out his heart in letters to both daughters and much of the baggage has been left behind.
The Bible doesn't address a solution specifically for baggage issues that were created by parents.
But, it does.
Just like absolutely everything else we have to trust that He is enough.