Name change

Hello, my father Mr. E.S CHRISTIE had been using his name in the form initials since birth till early 2018 as mentioned here and previosuly all of his ID cards/docs bear his name in the mentioned form. Recently, my father applied for his passport in 2018 and therefore had to elaborately mention his full name in the passport as Mr. ERNEST SAMUEL CHRISTIE, he received his passport with his full name and later got other his govt ID cards(i.e Aadhar, PAN & Voted ID Card) and name in bank records as his full name (as in passport) to make the all records match. My father is now in the process of selling his house owned jointly by him and his deceased wife (my late mother), the existing registry of this property bears his name as initials (i.e Mr.E.S CHRISTIE) , he therefore wants to know before executing the sale deed if he needs to furnish any affadavit to get the name form updated in the records of sub registrar/as a proof OR he may simply produce his old and new govt. issues ID cards to prove his idendity (This query arise as my father would be accepting the bank draft against sale of property in his new form of name matching the bank records i.e Mr. ERNEST SAMUEL CHRISTIE . PLEASE ADVISE