Where Ink and Pa is from the present, and Pran and Pat is from the Past but due to an unknown phenomenon, Pran, Pat, Ink and Pa's souls time traveled to their different timelines.
Where Pran and Pat will become Ink and Pa's in the present, and Ink and Pa's souls would become Pran and Pat's in the past.

The change would always happened without fail during every weekend since that strange occurrence happened. Pa then discovered that Pat was her great grand father, and Ink didn't know what link she has to pran.

Could they fix their perspectives time line? Or they would permanently change souls?.