Is it considered disobedience for a son to refuse to return a plot of land to his mother, which she had sold to him and his brother, while she falsely claims that he seized it, and she refuses to communicate with him after the court rejected her lawsuit, and her aim is to return the land to her brother?

If the sale was genuine, the mother does not have the right to reclaim it except through rescission (iqalah). If the sale was fictitious and a gift, then the gift is not valid if it favors some children over others, unless she gives the others their equivalent. If the gift is valid and there is no favoritism, the mother does not have the right to revoke it except by way of 'i'tisar (reclamation), which is the parents' reclaiming what they gifted to their children out of affection. 'I'tisar is not permissible if the child's circumstances have changed due to marriage, debt, or poverty. 'I'tisar is permissible for a legitimate or ordinary purpose, not with the intention of inciting animosity among the children. One must be dutiful to the mother and treat her kindly.