Guest Stars Oscar Unsworth as Rhodri Howells Harry Unsworth as Rhodri Howells Seren Letherby as Rhodri Howells Mark Lewis Jones as Steve Baldini Hannah Daniel as Cerys Jones Eiry Thomas as DI Susan Williams Demi Letherby as Alys Howells Lacey Jones as Megan Howells Aneirin Hughes as Tom Howells Suzanne Packer as Delyth Lloyd Bradley Freegard as Evan Howells Catherine Ayers as Lisa Connors Alex Harries as Arthur Davis Rhian Morgan as Marion Howells Mali Harries as Bethan Price Matthew Gravelle as Terry Price Morgan Hopkins as Gareth Taxi Menna Trussler as Eira Jones Gareth Jewell as Gavin John Gilly Adams as Judge Walker Llion Williams as Alun Jenkins Jenny Livsey as Dr. Samantha Beynon Boyd Clack as Alwyn Thomas