Know that a curse, even (simply) the indignation of parents acts very strongly. And even if the parents did not curse their children, but simply became indignant because of them, then the children do not have a single bright day in their lives: their whole life is one continuous torment. Then such children suffer greatly throughout their earthly life.
The parental curse includes all the bad words we have said throughout our entire lives, i.e. not only those that are said: “I curse you,” but also such as: “fool, moron, underdeveloped, unreasonable, freak, ignoramus, you will see it in your children,” etc. (negative words).
We only have the right to say: “God save you, God protect you, God help you, and I believe in you, that you will succeed, I am glad that you made an independent decision, but you should have consulted me... and all in that spirit (positive).”
A child is an innocent angel by nature and if he has deviations due to bad upbringing, then the reason is in us. Look for sin in yourself and eradicate it. Having cleansed yourself, the child is automatically cleansed. A mother's prayer for her children drives away all demons from them (the demon of drunkenness, the demon of smoking, the demon of fornication, etc.). A mother's prayer will get the child from the bottom of hell. Cry for your children, mothers, and do not curse, and the Lord will arrange everything.
☦️Saint Paisios of Mt. Athos (Quote Translated into English)