On husband demise you and your mother in law are legal heirs 

father in law and brother have no share in his assets 

inform company that under provisions of Hindu succession act father is not class 1 legal heir

Since you were married to him, and he didn't made any nominees all the money which he was holding will be equally succeeding to His father mother and you. 

Now you can talk to your in laws about the same and take NOC from them. It will be good that you take the death certificate from Municipal Corporation and claim money from banks while other securities will be equally distributed.

If a person dies interstate that is without will, the court has to decide the succession and hence you need to file for succession certificate.

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-   Nomination is irrelevant. 

Company have to distribute to legal heirs only. 

-   You are definitely legal heir. 

Your mother in law is also legal heir. 

You can not deny her share. 

Father in law and brother in law are not going to get share. 

-   You can apply duplicate death certificate from municipal office. 

- As per Hindu Succession Act, if son dies intestate without leaving behind a will then his property would be devolved upon his class I legal heirs.

- It means that his property and assets can be claimed by children, widow, mother

- Hence after the death of your husband and in the absence of children , you and your mother in law having right to claim only and not father & others.

- Further , you can get his death certificate direct from the office of Registrar in Delhi. 

You can contact me , if detailed suggestion needed. 

 Death certificate  you can obtain from Municipal  Authority by furnishing date of death and name of deceased, it is public document available to all. Cause of death will mentioned in death certificate. You have equal right  in the ancestral property of husband with other legal heirs. The share of husband in ancestral will transfer on you. You also have equal share in the self acquired property of husband. If you want of have your share you have to file a suit in the District Court. Issue lawyer’s notice  to all legal heirs seeking partition  and separate possession of property. After that file a suit in district Court for partition and separate possession. You will get your share. Your right in the property will not be affected even after you remarry.

1. Very sorry.  On your husband's intestate ( without executing a WILL ) death, all his movable and immovable properties get devolved equally to your deceased husband's mother ( mother-in-law ) and you, i.e., 50% each.

2.  Make an application to TCS, insurance company, bank, etc, along with marriage certificate and your husband's death certificate. If you are denied death certificate of your husband by your in-laws, obtain duplicate copy of the same from Corporation.

Dear Ma'am, 

1. Since your husband died intestate, i.e. without leaving behind a will the property will be equally distributed amongst his mother and brother; his father will not receive any share. 

2. you will receive the death certificate from the Municipal Authority and you can communicate with the company regarding the share in peroperty. 

3. nomination does not have any consequence. 

Thank You

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As per law the company can settle his death benefits to the legal heirs of the deceased employee and as per Hindu succession Act, the class I legal heirs are his wife and mother alone, his father cannot claim any share in the capacity of class II legal heir during the presence and availability of class I legal heirs. 

You can inform the company about it in detail and ask them to not to divide the settlement amount into three parts, instead it can be divided into equal parts and can be disbursed to you and your mother in law separately.

You can even issue a legal notice to the company about this.

About the death certificate you can obtain a copy of the death certificate from the local civic authority where it was registered.

You can get the cause of death certificate also from the concerned hospital, if they refuse to furnish the same, you can issue a legal notice through your advocate and obtain the same.

As far as his bank account the balance amount also shall be disbursed among the class I legal heirs equally hence you cannot refuse to give your mother ion law her respective share in that.

1. The Class 1 heirs of a Hindu male dying intestate are his mother, widow and children.

2. Since your husband had made no nomination for his salary or other emoluments it will be given to you and his parents.

3. You can obtain a certified copy of death certificate from the Municipal Corporation if his death has been registered.