1) how was payment made by you ? by cheque or cash ? you have any evidence cheque was issued 2 years ago ?
2) once you issue cheque and your father in law deposits the cheque on dishonour of cheque on any ground your father in law can file case of cheque bouncing against you .
3) stop payment of cheque is no answer . your father can file civil and criminal proceedings against you . you cannot escape your liability by asking bank not to honour the cheque