What is the religious ruling on the action of a son in whose name the house was registered with the approval of the father, mother, and sisters, and is he obligated towards his mother and sisters?

If the father vacated the house for his son, and the son took possession of it during the father's lifetime and while he was of sound mind, then the house becomes the property of the son according to the majority of scholars. However, if it was merely a written transfer or a gift, and the son did not take possession of the house, and the father continued to live in it until his death, then it is considered an inheritance to be distributed among all heirs according to their legally prescribed shares.