"Next of Kin" is pretty much the standard vigilante movie. Only the actors were changed to protect Charles Bronson in "Death Wish" (1974) and Sylvester Stallone in "First Blood" (1982) from this overplayed formula movie.
Truman Gates' (Patrick Swayze) brother has a brand new truck and is selling wholesale cigarettes. He should be shot for that. Oh, he was. Evidently against the advice of his partner the brother decided to protect the cigarettes from hijackers with his life. On the other hand little Joey Rosselini (Adam Baldwin) is showing off and can not back down from the challenge.
Now Truman must identify the person whom his brother insulted and incarcerate him. You guest it; the rest of the kin which includes Blair (Liam Neeson) thought you were supposed to "incinerate" him. So the fun begins. Bang! Bang! Soot-um up.