“Family Blood” (*1/2 out of four) was a confusing and tedious horror show about a recovering drug addict (Vinessa Shaw) who relocates to a new city with her two teenage children but falls into the clutches of an evil neighbor (James Ransone) who threatens her and her children and their sanity. Much of it is routine, the rest murky and senseless. Even the usually strong Shaw seems to be mostly going through the motions. It’s about time these crop of horror movies received a transfusion of some fresh “blood.”