claim over father's property

Dear Mohith,

               You have absolute right over your father's property along with your step bro/sis, if he dies intestate ( without creating will ).

If your father has got all self aquired property, he can transfer that property through gift deed or will to any one he likes. Then you will be not having any rights over that specific property. 

Collect all the documents of your father's property and consult an Advocate.

In respect of self aquired property, you have no rights during your father's life time. Further during his life time, he can sell, gift or by creating will bequeath the property to anyone he wish.

If he dies Intestate, then you have equal rights in his self acquired property.

If you are in good terms with him, you can approach him personally.

If he is not in good terms with you, he may be alert and bequeath property to his second wife and other 2 children by anticipating future consequences from you.