Aunt transferred through sale deed but there is no Will

Hello Sir, My father's sister purchased a property who was unmarried and living with us. She wrote a will in July 2005 declaring my father as the future owner of this property. But, In Jan 2006 my aunt (Owner of the property) sold with registered sales deed for second floor with roof right to me. But, sadly in may 2006 she died without making any amendments in the will after sales. So, now we want to understand if we can go for a probate process for this will. And my father is the only legal heir for the remaining portion of property. We wanted help regarding case reference for similar cases.