For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
What about;
(Exodus 20:5)--"You shall not worship them or serve them; for I, the Lord your God, am a jealous God, visiting the iniquity of the fathers on the children, on the third and the fourth generations of those who hate Me,"
(Deuteronomy 5:9)--"You shall not worship them or serve them; for I, the Lord your God, am a jealous God, visiting the iniquity of the fathers on the children, and on the third and the fourth generations of those who hate Me,"
(Exodus 34:6-7)--"Then the Lord passed by in front of him and proclaimed, "The Lord, the Lord God, compassionate and gracious, slow to anger, and abounding in lovingkindness and truth; 7who keeps lovingkindness for thousands, who forgives iniquity, transgression and sin; yet He will by no means leave the guilty unpunished, visiting the iniquity of fathers on the children and on the grandchildren to the third and fourth generations."
The "curse" on the children's generation was under the law. There are no curses under the new covenant unless one is rejecting Christ. But even that is individual, not generational.
However, children often behave as they are taught or not taught. There are social and familial environmental factors but these are not curses.