Daniel 5:1-4
Belshazzar the king made a great feast for a thousand of his lords, and drank wine in the presence of the thousand. While he tasted the wine, Belshazzar gave the command to bring the gold and silver vessels which his father Nebuchadnezzar had taken from the temple which had been in Jerusalem, that the king and his lords, his wives, and his concubines might drink from them. Then they brought the gold vessels that had been taken from the temple of the house of God which had been in Jerusalem; and the king and his lords, his wives, and his concubines drank from them. They drank wine, and praised the gods of gold and silver, bronze and iron, wood and stone.

Although Nebuchadnezzar may have learned the lesson it does not mean all his family members learned it.
Belshazzar is not the son of Nebuchadnezzar but the language indicates a previous king (father) had brought the Temple vessels to Babylon.
They drank, toasted, and praised the gods of Babylon with what belonged to the One True God.
He was totally disrespected!
Nebuchadnezzar may have learned his lesson but you cannot pass life lessons down to the generations that follow.
You can teach but they must follow.
You can preach but they must become disciples.
You can pray for them but they must accept the Savior.
You can point the path but they must take the step.
Belshazzar does not pay heed to the lessons of the past.