From Let the Right One In to What We Do in the Shadows, the domesticated wing of the vampire genre is getting overcrowded. So frequent Rian Johnson collaborator Noah Segan has done well to wangle himself a few inches of elbow room in his directorial debut with a surprisingly gentle, ruminative and haunted film concerned with family and belonging. Focused on an estranged father and daughter on the road played by Segan himself and Victoria Moroles, it almost plays out like an undead Paper Moon. Blood Relatives starts with a Near Dark-like glower, as Segan’s biker-jacketed drifter Francis makes a...