Time period for filing Criminal Case

Hello sir/ madam, My uncle cheated our mother of getting her signature of stating some false information in registrar office of giving small amount where the property is belongs to our ancestors. But, we find these all after5 years which is now from the date of signature issued and he also used someone fake signatures like my family members. Is there any time limit for filing criminal case against him? I want to file a criminal case against him but, everyone since its almost near to 5 years, its not possible...if do, wat shud I do need to do? Its not our fault to find details coz he was kept everything in his hand.. Even my grand ma also din know how much property they had. Kindly advice sir...i wud be thankful to you. Hopefully waiting for your suggestion