I'm in the three stations club, at least if I walk fast enough.
Montpelier, Redland, Clifton Down.
That must be VERY rare ... also possible at Ribena, Birchgrove and Ty Glas ... not many other places though. New Beckenham, Kent House, Clock House?
I do like the idea of a Ribena station, but I think you might mean Rhiwbina.
As it happens, I spent the first 10 years of my life living one hundred yards from Clock House station, from where Clock House, Kent House and (just) Beckenham Junction stations were within 15 minutes walk, with Elmers End and New Beckenham stations about 20 minutes away. I then spent my next 8 years living about 200 yards from Kent House station, from where Kent House, Clock House and (just) Birkbeck stations were within 15 minutes walk, and New Beckenham, Penge East and Penge West stations within 20 minutes, and Beckenham Junction and Anerley almost as close.
I then moved to Cardiff, but not to those parts...