If a Hindu male dies intestate, that means without the will, then the property is divided among his legal heirs according to Hindu Succession Act, 1956. The property is first given to heirs of Class I and if no heir is alive in Heirs of Class II and then to agnates and cognates in the order. The priority is always given to the Class I heirs.
According to Section 10 of the Act, class I heirs include:
Widow of a predeceased son,
Son of a predeceased son, and so on.
After the 2005 Amendment to the Act, the daughters were also added as the heirs and they had equal rights as the sons.
Therefore, in your query, if the deceased has left behind only children and no mother or widow, then the property will be equally divided among the three children.