This is called law of Adverse Possession
If you are in peaceful possession of property, but you do not have property title documents, then two situations may arise ;-
1) No one except true owner of property can evict you from possession of property.
2) Even true owner losses his rights if you are in peaceful possession since more than 12 years. You can say that "Since you did not disturb my possession for 12 years, I have now become owner of this property."
Here, you must prove that since 12 years, you were openly enjoying this property, but no one came to challenge your possession, even by giving a notice..
This Law of Adverse Possession.
Haresh Raichura
20/10/14