David "Dave Coaches '' Lloyd Gooch (Steffan Rhodri) - Coach driver in Barry and Nessa 's (Ruth Jones) fiancé, after they got engaged in the Christmas special. Aspersions are cast regarding his sexual health in Series 1, although it is revealed in Series 2 that he has been to "the clinic ''. He is the only person, other than Bryn (Rob Brydon) and Jason (Robert Wilfort), who knows what happened on the fishing trip, after Bryn told him to get the matter off his chest. His relationship with Nessa results in both Bryn and Jason being incredibly nervous about him telling their friends what happened, although he makes it very clear to Bryn he would n't tell anyone about it. He also has his own company named Dave Coaches. He often shows jealousy towards Smithy (James Corden) for being the father of Nessa 's child. Smithy gets jealous of him for always spending time with his son and treating him like his own, and in the final episode leaves Nessa at the altar as he does n't believe she loves him. Nessa 's father mentions him having "blood on his hands '', but says he was joking, knowing that "nothing was proven ''. Dave often has a strained relationship with the other characters, and has publicly had angry exchanges with Bryn, Smithy and Pete (Adrian Scarborough), who punched him in the face after he made an uncharitable remark about his wife, Dawn (Julia Davis). Jason West (Robert Wilfort) - Stacey 's (Joanna Page) elder brother, son of Gwen (Melanie Walters) and her late husband, Trevor. Lives in Spain with his boyfriend, José. He and Bryn (Rob Brydon) share a rather awkward relationship due to some mysterious goings - on on the fateful fishing trip. Although the events of the fishing trip are never explicitly revealed, it is strongly implied that there was a close and intimate encounter between Jason and Bryn. When they attempt to explain to Dave the reason for what they did that night, Bryn says "It was freezing cold... and when you 're that cold you - '' before being cut off by Gavin entering the room. He is disappointed in the first series when Gavin (Mathew Horne) and Stacey get married and he is not chosen to take Stacey down the aisle. He and Bryn eventually become friends again, something they are both glad about. Peter "Pete '' Sutcliffe (Adrian Scarborough) and Dawn Sutcliffe (Julia Davis) - Friends of Pam (Alison Steadman) and Mick 's (Larry Lamb). They have a very strained marriage and regularly insult each other in public. Also part of the ongoing joke that characters share their surnames with serial killers -- in this case Peter Sutcliffe, the Yorkshire Ripper. He punches Dave in the Christmas special. He also attempts a threesome in the beginning of Series 2 with his wife Dawn and a man named Seth. It did n't work out as Seth said the photo was not representative of them as a couple. The couple renewed their vows in Series 3. They have two children, Fiona and Alex. In the series finale of Series 1, their surname is revealed to be Whitely, but in the 2008 Christmas Special, it is revealed to be Sutcliffe. Catherina "Cath '' Smith (Pam Ferris) - Smithy (James Corden) and Rudi 's (Sheridan Smith) mother who first appears in the first episode of Series 3. She is rumoured to have had a lesbian relationship with the headteacher of Gavin (Mathew Horne) and Smithy 's primary school. She claims to suffer from narcolepsy, though Pam (Alison Steadman) attributes this to her excessive drinking. She attends single mother support groups and has been known to perform lewd acts on webcam, having once accidentally exposed herself to Nessa (Ruth Jones) thinking she was a man named John. Doris "Dor '' (Margaret John) - Gwen 's (Melanie Walters) elderly next door neighbour. She looks like a stereotypical "little old lady '', in sharp contrast to her behaviour and blunt, profanity - littered conversational style. Doris regularly dates younger men, even offering herself up to Gavin (Mathew Horne) for "discreet '' extramarital relations, and is described by Bryn (Rob Brydon) as "a player ''. She has a daughter named Moira, whom she loathes and would like to "smother '' if she saw her again. Gwen even goes so far as to say "she was a nasty piece of work ''. It is Doris who spots the unfortunate coincidence of Gavin and Stacey (Joanna Page) sharing the West and Shipman surnames with serial murderers Fred and Rose West and Harold Shipman. Ruth "Rudi '' Smith (Sheridan Smith) - Smithy 's (James Corden) sister, also likes to be called "Smithy '' in an attempt to imitate her brother, with whom she often fights. Neil Noel Edmund Smith aka Neil, the Baby - The son of Smithy (James Corden) and Nessa (Ruth Jones), named after both Smithy and Nessa 's father. His middle names come from Smithy 's uncle Edmund and Nessa 's friend Noel from Hear'Say. Neil Jenkins (Ifan Huw Dafydd) - Nessa 's (Ruth Jones) father; appears at the Christening but is obviously uncomfortable at being back in Barry due to unknown previous events. He is a part - time actor who has appeared as an extra in Lark Rise to Candleford and as a man in a coma in Holby City. Dick Powell (Gwynfor Roberts) The only exclusively Welsh - speaking inhabitant of Barry. Sells items on the black market such as satellite navigation systems and meat that his brother steals from the slaughterhouse where he works. He enjoys chicken and Glamorgan sausage sandwiches. Deano (Mathew Baynton) is a friend of Gavin (Mathew Horne) and Smithy 's (James Corden). He works with Smithy and is known for being gormless and somewhat naïve. He learnt Welsh prior to coming over to Wales with the "Essex Lads ''. He was n't at Gavin 's stag, but got a T - shirt made afterwards when they went to the foam party. Among his idiosyncrasies is a fondness for drinking a mixture of equal parts tea and coffee, which he calls a "toffee '' or a "cea '' (pronounced "key ''). Owain Hughes (Steven Meo) - one of Gavin 's (Mathew Horne) co-workers at his new job in Cardiff in Series 3. Constantly the subject of an unclear joke - "My name is Owain Hughes and before you ask, no I do n't! ''.
who plays james corden's sister in gavin and stacey
Sheridan Smith Sheridan Smith