Hard Gun (1996)

The policeman Pitak (Jan Janmulltree) switches from a band of thugs. Only the leader (Panna Rittikrai) survived - and vows revenge. With the help of his protégé (Tony Jaa), he sets out to terrorize the cop. Who is now staying with his family: his widowed dad, who is also a policeman, his younger sister Ann and brother Lau. They all float now in mortal danger.