<Li> Richard Campbell, Sr. (Clark Gregg), is Christine's ex-husband, who maintains a frequent presence in her life . After divorcing Christine, he finds love with another woman also named Christine, who is nicknamed "New Christine". He suffers from commitment issues; taking months to tell New Christine that he loves her and four years to propose to New Christine . Richard's presence in his ex-wife's life causes a strain between himself and New Christine, which results in her walking out on their wedding . Richard accepts the fact she doesn't want him back, though he and New Christine reunite when she becomes pregnant . </Li> <Li> Matthew Kimble (Hamish Linklater), is Christine's long - suffering, live - in brother who often acts as a low - key straight man to his neurotic sister . Matthew has trouble finding a career path; he enters and then quits medical school before pursuing a career as a therapist . He suffers from an unhealthy attachment to his mother; whom he still kisses on the mouth and needs to speak to on a nightly basis in order to fall asleep . He constantly teases Christine's age, usually implying that she is "old". Matthew frequently dates women but is rarely interested in them beyond a one - night stand . He is also portrayed as a pot smoker, but in one episode, he claims that he has never done drugs . </Li> <Li> Richard "Ritchie" Campbell, Jr . (Trevor Gagnon), Christine and Richard's son, who attends a posh private school . Often smothered by his mother, his lack of masculine traits begins to worry his father . He is not very bright and mediocre in all his after - school activities . </Li> <Li> "New" Christine Liesl Hunter (Emily Rutherfurd), is Richard's young, sweet and confused girlfriend, nicknamed New Christine . She is sometimes annoyed by Richard's continued closeness with Old Christine, who treats her with derision, leading to friction between the two women . She is also frustrated with Richard's lack of commitment to their relationship and walks out on their wedding due to his dedication to Old Christine . She also becomes furious when she learns that she is pregnant, even though Richard told her he had a vasectomy . They re-kindle their relationship and Christine gives birth to a daughter named Dakota Christine Hunter - Campbell in the season 5 episode "Scream". </Li>

Who played richie on new adventures of old christine