Can christian illegitimate childreans will have right in father’s property?

As my step brother’s are also illegitimate childreans of my father.As he dint get married to both of my mother’s as my step mother is allready maried in church without giving divorce she was staying with my father and then he started having releationship with my mother.after my father dimise my step brother’s are not intresting in sharing the property as they are in the position We are from A.P Hyderababd INDIA kindly advice.