Validity of gpa

the sale deed is invalid for the simple reason that as on the date of sale deed the executants have dead, the GPA has no validity.

There were 5 Members in the family. All had interest/share in the property.
A sale deed was effected after two of the GPA executers died.

Thus;

1. the sale deed is invalid to the extent of "share" of those brothers died before "sale deed" because the Power of Attorney is a contract of agency which is revoked upon death of the principal. (except: interested agent (S.202 of Contract Act) )

2. the sale Deed is valid and can be enforced to the extent against the share of those brothers who were alive at the time of said Sale Deed.

PS: such question can not be decided on majority basis.

If proper stamp duty is not paid on the GPA and that is not registered, no sale can take place. In such case GPA holder can only present the document for registeraion, not as a seller.

On the other hand, if GPA is stamped with proper duty, irespective of the death of some executant sale will be valid and enfoceable, on the contrary sale is null and void as a whole. 

Thanks for your reply sir.

 The GPA is a registered in a Stamp paper document in the sub registrar office with Num xxx of year xx contains xx pages.

  Please also clarify the significance of the words"This  Power of Attorney shall be in force until  it is revoked in writing". 

 Does it mean one of the 5 executants should revoke it or anyone can revoke it.

The document mentions that the executants are a joint family including the person it was given to (the youngest brother).