On demise of your father in law your wife , brother wife and 2 daughters would be legal heirs 

2) your wife as daughter would have 50 percent share in property 

3) her brother legal heirs would inherit balance 50 per cent 

4) I presume mother in law predeceased your father in law 

Yes. Your wife is the sole survivor and the only legal heir. So she can claim and get 100%

1) No, your wife don't have 100% rights, instead of that she has 50% share in the property.

2) Now under whose possession property is your wife's or sister -in-laws?

You have to file application in the district court seeking legal heir certificate

Dear Sir,

Dear Sir,

Your wife having share in her fathers property but her sister in law have no right at all but her daughters having their rights to claim their share.

After the death of your  father  it naturally devolves on the following formula

Section 8 in The Hindu Succession Act, 1956

1. General rules of succession in the case of males.—The property of a male Hindu dying intestate shall devolve according to the provisions of this Chapter—

(a) firstly, upon the heirs, being the relatives specified in class I of the Schedule;

(b) secondly, if there is no heir of class I, then upon the heirs, being the relatives specified in class II of the Schedule;

(c) thirdly, if there is no heir of any of the two classes, then upon the agnates of the deceased; and

(d) lastly, if there is no agnate, then upon the cognates of the deceased.

Hindu Succession Act, 1956 [Section 8] HEIRS IN CLASS I AND CLASS II

CLASS I

Son; daughter; widow; mother; son of a pre-deceased son; daughter of a pre-deceased son; son of a pre-deceased daughter; daughter of a pre-deceased daughter; widow of a pre-deceased son; son of a pre-deceased son of a pre-deceased son; daughter of a pre-deceased son of a pre-deceased son; widow of a pre-deceased son of a pre-deceased son.

CLASS II

1.Father.

2.(1) Son’s daughter’s son, (2) son’s daughter’s daughter, (3) brother, (4) sister.

III. (1) Daughter’s son’s son, (2) daughter’s son’s daughter, (3) daughter’s son, (4) daughter’s daughter’s daughter.

1. (1) Brother’s son, (2) sister’s son, (3) brother’s daughter, (4) sister’s daughter.
2. Father’s father; father’s mother.

VI.. Father’s widow; brother’s widow.

VII. Father’s brother; father’s sister.

VIII. Mother’s father; mother’s mother.

1. Mother’s brother; mother’s sister.

Explanation : In this Schedule, references to a brother or sister do not include references to a brother or sister by uterine blood

Apply for succession certificate from district court in name of legal heirs 

2) nominee is only trustee for legal heirs 

The sister in law and 2 daughters shall inherit 50 percent of the property and 50 percent shall be inherited by your wife.

No your wife cannot claim 100 percent.

See your wife can apply for succession certificate and can claim over her share of the properties.

First of all get a succession certificate from the competent court or legal heir certificate from the revenue officer then go ahead accordingly , before that all steps will fail.

Dear client, 

She is with 2 daughters and I think they shall be taken with sympathy.

Well FIL all assets will inherit 1/2 each to his children. And son share will inherit in his wife and daughters. Your wife has half claim. Partition suit will file.

No her sister in law can claim her husband's share. 100 percent only can be claimed if he father had a will to bequeath 100 percent to her.

As per you query your wife and your brother in law wife will get equal share in your fathers in laws  property as all are the legal hiers. 

If no nomination was availed then by producing legal heir certificate the amount can be withdrawn from the bank.

1.  IF said Father-in-Law has demised without executing a WILL of his aggregate properties, THEN the property shall be EQUALLY claimed by:

a)  Sister-in-Law - 50% aggregate

b)  Daughter (wife) - 50% aggregate

2.  There is no legitimate way to avoid giving the 50% share to the sister-in-law.

Your wife's father is reported to have died intestate, hence all his properties shall devolve equally on all is legal heirs, his deceased son is also one among the legal heirs  hence his wife and children are entitled to one such equal share.

Your wife cannot inherit the entire proeprty by herself, her sister in law and their children are entitled to their legitimate share in it.

Your wife can file a partition suit claiming partition of the property by good and bad soil and metes and bounds and to divide the same into equal number of share as per the surviving legal heirs and top allot one such share to her.

Your wife is entitled to an equal share in the FD amounts also 

1. As per the information mentioned in the present query, makes it clear that there are both movable/ cash in banks/ or FDs etc. and immovable properties.
2. For immovable you wife would be needed a succession certificate from the court of law.
3. And for other movable your wife would have to get legal heir certificate from the office of the Tehsildaar office.
4. Now, let me tell you the shares as to who all would be having:-
5. Where there is no nominee then there would be yoyrnwife as well as brother in law notional share would be there.
6. And where he was the nominee but as he expired still there wound be the same shares as stated above.
7. Out of the two notional shares, his wife would take the same.