“Blood Father” (**1/2 out of four) was a reasonably endearing and engrossing melodrama starring a well-cast Mel Gibson as a temperamental former alcoholic who reunites with his estranged 16 year old daughter (Erin Moriarty) to protect her when drug dealers are out to kill her forcing both of them to take it on the road. Gibson is good in a role that in many ways obviously parallels his own off-screen behavior and Moriarty is terrific as his daughter; otherwise this covers all-too-familiar ground involving father and daughter reconciliation and road-movie cliches. William H. Macy and Michael Parks have good supporting roles as Gibson’s friends.