The video box says "horror," but Blood Relations is more of a mildly erotic noir thriller, at least for the film's first two-thirds. Marie (Lydie Denier) is the Eurotrash femme fatale, engaged to Thomas (Kevin Hicks), a young heir eager to inherit his grandfather's fortune. Granddad (everyone's favorite Martian, Ray Walston) is already dying, so all Thomas and Marie need do is kill Thomas's dad (Jan Rubes) to ensure Thomas is the sole heir.
Thomas brings Marie home to meet the family: just dad and granddad. All three generations of men take a liking to Marie, who resembles Thomas's dead mother (Rubes's dead wife, Walston's dead daughter). Things get kinky. Granddad asks Marie to call him "father." Then he asks her to strip naked and kiss him. So she does. Hey, he's worth a fortune, right?
Blood Relations threads noir terrain, so there's the requisite shyster lawyer to draft the will, his faithless wife (girlfriend?), and a creepy servant. No one is to be trusted, everyone plots against everyone else, forming shifting alliances over who might inherit the dying granddad's estate. There are faked deaths, lies and betrayals, and a dead cat. Dad romances both his lawyer's wife and Marie, bedding one and telling the other that his son "is not a real man" and will inherit nothing.
Blood Relations's milieu resembles that of The Shining and Curtains. All three films feature small casts wandering within vast snowbound mansions. Yet while The Shining and Curtains are enhanced by their stark wintry milieu, Blood Relations is diminished. Shorn of padding and distractions, the former two films reveal compelling stories, gripping emotional subtexts, and strong casts; Blood Relations is left with nothing but a banal hackneyed script, performed by competent but unspectacular actors.
Despite its lavish mansion set (the only location aside from a few hospital rooms), Blood Relations feels surprisingly cheap. Just a handful of characters wandering spacious halls. It doesn't feel spooky or claustrophobic (as does The Haunting). It only feels empty and low-budget and... cheap. Only one servant in sight.