Najafi Q&A: Gift

If a person gifts a building to someone by registering it officially in government records, but the donor does not vacate it, does not relinquish control, the donee is not granted permission, does not take possession of the gift, does not exercise authority over it, and does not receive any income from it, can it be considered that possession has been achieved from a religious perspective?

Does a father have the right to reclaim a specific amount of money from his son, which he had lent to him, after he had voluntarily waived the amount without coercion or undue pressure? The father had repeatedly waived the same amount in this manner, and to confirm this, a document was written and signed by both the father and the son, with some witnesses attesting to the father's waiver. After a period of time, the father then requested to cancel what he had pledged to waive, claiming that he had waived it out of shyness, although he acknowledged that the waiver was made without coercion or pressure from the son?

Is it permissible for a parent to grant one of their children a gift without involving the other siblings?

In the name of Allah, according to the traditions of Ahlulbait (PBUT), there is no obligatory or optional ruling proved in a reliable source. Allah knows best.