The mysterious man in white is Martin's suspicious, old granduncle, Tateh Cuda. Due to the death of Martin's immediate family in Indianapolis, Cuda has reluctantly agreed to give Martin room and board as he is the closest living relative and Martin will share the house with him and cousin Christine in the dying town of Braddock, Pennsylvania.
Cuda is a Lithuanian Catholic who treats Martin like an Old World vampire. He forbids his nephew from speaking to Christine and tries unsuccessfully to repel him with traditional methods: strings of garlic, and holy objects like a crucifix and blessed statues. Martin mocks these attempts and says bitterly, "There's no real magic... ever." Martin also says forcefully to Cuda that he is a family member, not someone to be treated like a "Nosferatu". Cuda warns that if Martin murders anyone in Braddock, he will stake him through the heart.
Martin Movie Trailer

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