Is the husband considered sinful or unjust if his wife relinquished a plot of land to him after purchasing it with her gold and her daughter's gold without his knowledge and consent, and then the husband gave her more than the weight of her gold based on the ruling of the people of reconciliation, and now the wife accuses him of taking her money and threatens him with hellfire?

A wife has the right to dispose of her own property without her husband's permission, as evidenced by the actions of the Mothers of the Believers.

If the wife relinquished the land out of shyness, then the safest course of action is to return it to her.

It is permissible to reclaim the gold you recently gave her. As for the daughter's gold, her father is her guardian, and her property belongs to her alone. He is not permitted to own it, but only to benefit from it when necessary.