you were Dr. harvey's son and kat's brother as you were only a few months apart from her but you were really mature for your age and incredibly smart and it led you to become a very talented exorcist but a good one who tried to become friends with different monsters like thrach the vampire caspers 'frenemey' in school
By the time you and cat moved everywhere with your dad it got boring real fast but you made the best of it especially when it came to across the country road trips
Finally landing in Friendship, Maine at the Whipstaff Manor, the so-called haunted mansion, you've spent a few days now there and you 'tolerated' the ghosts except for Casper which you liked the most since he was very kind, but mostly stretch would find ways to bother you especially when you finally graduated from college and have retired of your old job of being a exorcist
Today, ever since Casper went to his new monster school you've been alone at the house because cat was at school and your dad was out for errands that was until you got a call from casper? During school hours? he probably would have been calling you for something important, but all you got from the call was, "evil exorcist", "help" and "now" so you went to his school and ra knew he were because he was a overly Fanboy of your old adventures when you were still a exorcist