Gpa to sale deed execution

Owner-Party X (Two Brothers) sell their land to my Mom through General Power of Attorney in 1988 which is not registered. GPA consists of: 1. To alienate the schedule property either by way of sale, mortgage, gift, lease, or otherwise any person on behalf of me/us & also receive the sale proceeds and other proceeds & pass receipts thereon & also execute the registered instrument & admit the execution thereof before jurisdictional sub registrar 2. This GPA signed by me is not revocable (IRREVOCABLE) Affidavit consist of: 1. We further state that we both together have sold the above said site to my Mom wife of …. Residing at …. for an agreed sum of Rs…and have received full payment from the purchaser. 2. Due to fragmentation act, the site will not register for the time being and we will come to the concerned sub registrar to register the same in favor of the purchaser whenever she wished to do so. Sale Agreement consist of: And whereas the vendors are in need of liquid cash and are desirous to sell the above said schedule site in favor of above purchaser for an agreed sum of Rs….have this day paid the full sum of Rs…and the vendors have acknowledged the receipt for the said sum before the following witnesses and have delivered the schedule site to the purchaser along with all records, title related to the schedule site. And whereas the vendors further agree to come to the concerned sub registrar to register the same in favor of the purchaser or her nominee at the time of registration. In 2002, my mother further executes a Sale Deed in favor of my dad and registers the land on my father’s name. This registration is reflected in EC as well. However, the actual owners name has not been included in the sale deed, stating the execution is taking place on behalf of the Party X nor we have the Party X signatures in the sale deed. Currently we have a 3-storied building constructed and living here since a year. Now my dad wishes to execute a 50% undivided share gift deed in favor of me(Son). Questions: 1. As the GPA is not registered, is this a concern? However, SC passed the rule that sale of property through GPA is not valid only in the year 2011. 2. As the Owners have given rights to my mother to carryout sale, would the Sale Deed be valid? This was done in the year 2002 and still the SC rule wouldn’t apply. 3. Since the name of the actual owners have not been mentioned in the Sale Deed is this a concern if I or my father must sell the property or to execute the gift deed in my favor? 4. Is carrying out a rectification deed is a must to have the owners (Party X) names included in the Sale Deed. The owners-party X are not alive to have their signatures but my parents are alive. Or as the loan has been approved and the construction done, can we avoid this. Will this be a concern to sell the property in future? 5. Is the execution of rectification deed to include the owners name upon their death without their signatures valid