On your brother demise your mother and his widow would be the legal heirs 

Both will inherit half share.

His mother and wife shall get 50 percent each that is equal share in his property. And they shall receive benifit equal from any amount in bank and state .

mother and wife of your deceased brother will get equal share being only legal heir.

How many other legal heirs are there for the ancestral property 

With regards to the self acquired property both the mother and the wife will get 50% share in the property. 

Regardss  

If you are the legal heir then you can claim the property

Dear Sir,

Yes, your mother get one share in the ancestor property.

After the death of male 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

Your brother's own property will go to his wife and mother equally. 

All ancestral properties will be taken upon as part of joint family property in absence of any coparcener descendant of your brother.

Wife and mother are legal heirs class1 both get equal share in deceased property. 

Dear Sir,

You may rely upon Section 8 as follows:
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The properties on his name whether self acquired or ancestral/inherited, shall devolve on all his legal heirs equally namely his mother and wife on his death if he is reported to have died intestate.

There is no discrimination for distribution of his properties among his legal heirs, both will be entitled to an equal share.

1. The property of a Hindu male dying intestate devolves on his mother, widow and children equally.

2. If there is consensus between the heirs then partition can be done amicably through execution of a partition deed, else any heir can file a partition suit,