The Regd Gift Deed & Regd Release Deed are Ttile Deeds, as primary and as Link Documents respectively. The further records/Docuemtns transactiosn are coverign only for 5 years . Put all the documents and reocrs prior to Regd Release deed for at least 15 years to make godd Title and Possession for a period of 15 years .These all Title Deeds to be cosnidered for Loan .
The ancestral property caanot to be gifted legally to one son by ignoring the legal claim of all other claimants. Since the claim of Z on the property is not leagl, bank will not grant any facility against the secuirty of the said property. I presume you are a hindu as I am mentioning my opinion as applicable to hindus