Brother of Nick Wolfhard, who also acts. Son of Mary Jolivet and Eric Wolfhard, a writer.
Featured in the music video for the song "Guilt Trip" (2014) by Canadian punk band PUP.
Finn admitted to having a fear of clowns, appropriate for playing Richie Tozier in the new "It" movie.
Great-great-aunt was silent film and theatre actress Rita Jolivet. Finn's great-grandfather, Alfred Eugene Jolivet, was Rita's brother.