Settlement deed validity

you had said that the three storeyed building belongs to your fil.did he write a will ?.if so what were the contents?or did he die intestate

as far as ancestral property is concerned your husband can only will or gift his share alone in the ancestral property and not the entire ancestral property.if he had done so the other relatives whoever has a share in the ancestral property is eligible to file case as to declare the transfer of property illegal.

My fil did not have any will. 

The document says my husband gave away his share in exchange of 2000 sqft at the top. To make it much more clearer:

3 storeyed building = my fil

House building = fil and his 2 brothers joint property

Shop building = fil and his 2 brothers joint property

With the division initiated by elder brother:

3 storeyed building = elder brother who wrote that he gave up fil share in house and shop building

House building = younger brother got my fil ancestral share with my husband and elder brother writing saying they give up their share in this building

Shop building = 50% younger brother, 50% my husband of our share in joint property + 2000 sqft at top floor 

Elder brother later said document says 50% given to younger brother but doesn't say 50% given to my husband, hence he also will take share from the remaining 50. hence, 

Shop building = 50% younger brother, 25% my husband and 25% to elder brother of our share in joint property + 2000 sqft at top floor 

After sometime, elder brother transferred the three storeyed building to is wife

Now relatives want to divide house property. So it got divided to 3 parts and we got 33% of it. So three of us should get 11% each. Elder brother already said he doesn't want his 11% as he is happy with the three storeyed house. Younger brother is saying he owns all 33% owing to the agreement. But he wants me to vacate the 2000sqft house because it is not of same value as 11% my husband has given up and he feels cheated. He is asking us to move to a smaller place in the same building.

So my question is: was the agreement of 33% before the actual 33% has materialised valid, if not unfair? This is making younger brother question if my husband had given him 11% in equal value to take the 2000sqft

Similarily, what happens if someday shop building gets divided and I don't get the mentioned 2000 sqft ? Cause again this problem has occured because of assuming the 33% when the 33% had not materialised. will the transfer of 3 storeyed building to elder brother's wife still be valid

Please help as I don't know much law and both brothers are trying to take advantage of me becaus my husband has passed away.

since your fil had died intestate the property would devolve in equal shares over his mother (if alive), wife and children.the three brothers had made a family settlement among themselves.but they can do it over the three storeyed building alone and not the house and shop which is ancestral in nature.if at all they had partitioned it among themselves they can only do it on the share of their father in the ancestral property alone

So the previous settlement between my husband and his brothers is invalid. 

the settlement where the ancestral property had been involved is not valid,but its better to show the documents and discuss with a lawyer to get a clear picture

From your lengthy statements it can  be understood  that your father in law died without making  any will towards his share in the ancestral property which was later inherited by his children.Your husband also did not do anything properly as per legal  terms because legally he is not having marketable  title to the entire property therefore he cannot execute any document pertaining to the entire property in anyone's favor and there also, it can be challenged as invalid. Your father's elder brother also cannot take away the entire property on his ow without properly  distributing  his brothers share to them, his act of executing a gift deed on entire property to his wife  is also invalid because his children have a right to share  in his share of ancestral property.

A local lawyer  on verifying  the entire documents and  situations can be able to guide you more properly based on the eventful facts as well.