Sorry to tell you this but CCR quit as a group 16 October 1972 ( today is 33 years ago )
They never go back and play again,there is far to much differences between them.
If you want take Mom to see John Fogerty,look up his tour dates.Stu and Doug touring around as Creedence Clearwater Revisited.
I had the opportunity to see CCR 21 September 1971 in Royal Tennis Hall Stockholm Sweden.Good luck to you and your Mom.