1. Having your father's name as Khatedar in the Katha Certificate doesn't make him the absolute owner of the property.
2. In view of your mother's intestate death, the share of the property shall devolve equally to your father and 3 children.
3. Each one of the legal heirs is entitled to 1/4th share in the property.
4. Your father has no right over other 3 shares of his children to gift it to one particular child, because he is only a co-owner, along with 3 of his children. Atmost he can gift his 1/4th share in the property to any person, including his son.
5. Based on an Affidavit of other sons giving NOC in favour of their father to enable him to transfer name of the Khatedar in his name for the instant property does not make him the absolute owner for the entire property.
6. However if the other 2 Sons also join their father in executing the Registered Gift or Release Deed in your favour, then you can be the Absolute Owner of the instant property.