In which year your grand mother died?
You say your grand mother did not leave any WILL.
If the property was in the name of your grand mother, then how your Aunt (your father's sister) alone, without your father and other Aunt's consent and signature could have sold the poperty.
Many details are wanting in your matter.
Nothing is clear from your post.
Do not post in sms language. Post it in proper english sentences.
First clarify as to Who sold the property?