1. Did your father die intestate(without executing a 'WILL') or had he executed a 'WILL'.
2. If your father had died without executing a 'WILL', then your mother, brother and you will have equal share in your deceased father's property. In other words, each of you would be eligible for 1/3rd share in the property.
3. If your father had executed a 'WILL', then the property would devolve to the beneficiaries as narrated in the 'WILL'.
4. You can claim your share of property(if your father has not willed otherwise) by discussing with other legal heirs i.e. your mother & brother.
5. Settle the matter amicably without any misunderstanding between the three of you.
6. You can claim your share of property by way of partition of the property into 3 shares and you are eligible for one share.