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The documents you are valid equivalent to a promissory note. If the money is not paid when it is supposed to be you can bring a small claims court case to collect your money.
I think it is reasonable to believe you were to be paid within 30 days so you can bring you court case now. What you should do is send him a letter demanding payment within 10 days. If you are not paid, bring your lawsuit.
Send it to both the grandmother and through facebook. The one to grandmother send regular and certified return receipt requested.
You can do that, it would not hurt.
The letter should just say that you agreed to repay you the cost of getting the car that was impounded while in his custody and as a result of his actions. The money was to be paid by now. If I am not paid within 10 days of the date of this letter I will take legal action to collect what is owed to me.