Under Article 749 of the Civil Code, the donation of an immovable must be made in a public instrument in order to be valid, specifying therein the property donated and the value of the charges which the donee must satisfy. As a mode of acquiring ownership, donation results in an effective transfer of title over the property from the donor to the donee, and is perfected from the moment the donor knows of the acceptance by the donee, provided the donee is not disqualified or prohibited by law from accepting the donation. Once the donation is accepted, it is generally considered irrevocable, and the donee becomes the absolute owner of the property. The acceptance, to be valid, must be made during the lifetime of both the donor and the donee. It may be made in the same deed or in a separate public document, and the donor must know the acceptance by the donee.
 Rollo, p. 94.