What is the ruling on disposing of land purchased by the parents (with the mother contributing a much larger share), which was registered in the names of the children equally, given the children's desire to relinquish it to the mother without the father's knowledge? And is this relinquishment valid?

Cooperation between spouses brings happiness and thwarts Satan, who seeks to separate them. Efforts should be made to reconcile the parents and try to convince the father to establish the mother's share if she contributed financially to building the house and was not a donor. However, deceiving the father by having him sign contracts for the mother could lead to his displeasure and be considered a form of disobedience.