1. As per your statement of facts, 3 years are soon going to elapse as from the date on which you lent the money to him. If you wish to recover the money from this relative of yours then act swiftly as time limit laid down under the law to file a case for recovery of money is 3 years.
2. Since you did not enter into an agreement while advancing the loan the only proof which you can produce in the court is the passbook wherein the entry of amount advanced to him is reflected.
3. The proceedings can be initiated in the civil court at Delhi.
4. You can prosecute your relative both under the civil and criminal law. In addition to filing a case for recovery of amount you may also file a case for cheating and breach of trust against him.
5. There is no need to lodge any complaint with the police. Concentrate on recovering the amount through the civil court as you are on the verge of exhausting the time limit to file the case, whereafter your legal remedy will be foreclosed.