Validity of gift dead

Querist :
Anonymous
(Querist) 01 February 2011
This query is : Resolved
Respected Sir/Madam,
My Grand father has 2 brothers and 2 sisters (total 5 in family,Father and mother of grand father expired)and my grand father was adopted to another family.
my grand father is second in family.
my grand fathers elder bother is not married.
my grand father younger brother is married.
Both sisters are married.
Legally the whole property is shared among these 5 people in family.
Our elder grand father who is unmarried and stays close to us.His property is given to my father by executing gift deed with stamp duty of 6%.(coz my fathers father was adopted to another family)
All the grand fathers are alive.
I have below questions:
1) Is this gift deed valid?
2) will my younger grand father and his family has any right on this property?
3) will there be any ambiguity since my grand father was earlier adopted by another family?
4)what do we need to do to avoid any complexities from other members of family in future?
Thanking you in Advance.

Querist :
Anonymous
(Querist) 01 February 2011
my father is only son to my grand father