Is a son considered disobedient to his father if he cancels the legal power of attorney that authorizes him to dispose of his deceased mother's house, especially since the father believes the house belongs to him alone, with no right for the children in it?

If the father gifted the house to the mother and she took lawful possession of it, then the mother owned it and it became part of her estate. If the children then relinquish their share in it to the father and he takes lawful possession of it, it becomes his property to dispose of as he wishes. Otherwise, it remains the property of the children, and they have the right to revoke the agency. However, if it was not a gift but rather he registered it in her name for her to inherit after his death, then this is an invalid will upon her death, and the house remains the property of the father. It is advised to be dutiful to one's father and seek his pleasure, and it is forbidden to use deceptive means to deprive half-siblings of inheritance.