Although Ghosts season 4s big twist is unexpected, the CBS sitcom did hint at this development way back in season 2. CBSs Ghosts is a sitcom based on the British series of the same name from 2019. Ghosts centers on Sam and Jay, a couple who inherit a mansion from a distant relative. When Sam has a near-death experience, she gains the ability to see and talk to the ghosts that inhabit the home. The ghosts of CBSs Ghosts are a mismatched group including a surprisingly friendly Viking, a catty Civil War soldier, and a free-spirited hippy.

https://screenrant.com/ghosts-season-4-jay-twist-2-years-ago/