He and his wife Reanna have three sons. His hobbies include writing and illustrating fantasy characters and role-playing game characters, in addition to web design. He plays guitar and composes piano music.
Wilson and TAPS co-founder Jason Hawes are long-time co-workers at their day job as plumbers for Roto Rooter. The two are also co-owners of the Spalding Inn, based in Whitefield, New Hampshire. Wilson and Hawes, as well as other members of the group TAPS, frequently give lectures at schools and conventions. Wilson is also available to be scheduled on ghost hunting trips, and along with Hawes has used public ghost hunting events and personal appearances to raise money for various charities, such as the Shriners Hospitals for Children and Cure Kids Cancer.
Also, Hawes and Wilson participate in ghost hunting events created specifically for the paying public. More recently TAPS has offered an event solely hosted by the TAPS members. The personal ghost hunting events have gained more and more popularity over the years with television celebrity guests. TAPS co-hosts events locations such as the Stanley Hotel in Colorado, RMS Queen Mary ocean liner in California, and the Buffalo Central Terminal in Buffalo, New York.
On the 13th mid-season opener for South Park, Grant and Jason were both parodied and portrayed as easily frightened, going as far as to wet and poop their pants. However, neither the real-life Grant Wilson or Jason Hawes was offended, Grant even going as far as making a post to Twitter: "Thanks South Park!!! Freaking Hilarious!!"
- Ghost Hunting: True Stories of Unexplained Phenomena from The Atlantic Paranormal Society (2007) co-authored by Jason Hawes and Michael Jan Friedman
- Seeking Spirits: The Lost Cases of The Atlantic Paranormal Society (2009) co-authored by Jason Hawes and Michael Jan Friedman