He punishes the children and their children for the sin of the
fathers to the 3rd and 4th generation."
~ Exodus 34:7
I stress the fact that this subject matter is still debatable and that the Church has yet to officially rule on it, but proponents of generational healing - which include learned and respectable priests - cite the scriptural passage above as one of its scriptural foundations, and also testify to the positive results received by people who have sought healing of generational curses... and interestingly, the saintly mystic and stigmatist - Bl. Anne Catherine Emmerich - had also alluded to this concept in a few of her recorded revelations. In fact, one of her most controversial visions relates how Noah (who built the Biblical Ark) had placed a curse on Ham, his youngest son, after the young man grievously offended him:
like a black cloud and obscuring him. His skin lost its whiteness, he grew darker.
His sin was the sin of sacrilege, the sin of one who would forcibly enter the
Ark of the Covenant. I saw a most corrupt race descend from Ham and
sink deeper and deeper in darkness..."
To give a few more examples… parents who involve themselves in occult practices (e.g. the use of ouija boards, witchcraft) may inadvertently attract demonic entities and other evil forces to themselves and their children. Less extreme, but still serious afflictions, may include addictions (alcohol/drugs), social issues (marital problems/phobias), and chronic illness that consistently occur in a “Family Tree”, resulting in conflict and other devastating effects.
Those familiar with the Divine Mercy devotion will notice elements of that devotion in the prayer, which I purposely intended because of my own faith in the healing power of Our Lord's Divine Mercy - hence, the title I gave to it. As the prayer has been a blessing and a comfort to me, may it also be a blessing to others who pray it with faith... Jesus, we trust in you.