Guest Stars Oscar Unsworth as Rhodri Howells Harry Unsworth as Rhodri Howells Mark Lewis Jones as Steve Baldini Aneirin Hughes as Tom Howells Hannah Daniel as Cerys Jones Bradley Freegard as Evan Howells Eiry Thomas as DI Susan Williams Catherine Ayers as Lisa Connors Alex Harries as Arthur Davis Demi Letherby as Alys Howells Lacey Jones as Megan Howells Rhian Morgan as Marion Howells Celia Imrie as Rose Siân Phillips as Barnwr Owens Keogh Kiernan as Osian Isaiah Cai Forrest as Lewis Rachel Cheung as Rheolwraig Y Gampfa Kev McCurdy as Joe Price Marc Antolin as Athro Rhys Maria Pride as Julie Penry Sion Daniel Young as Gareth Matthew Aubrey as Mike Taylor