- Michael Caton as Darryl Kerrigan, the father
- Anne Tenney as Sal Kerrigan, the mother
- Stephen Curry as Dale Kerrigan, the youngest son, digger of holes, and the film's narrator
- Sophie Lee as Tracey Petropoulous (née Kerrigan), the family's only daughter, a newlywed hairdresser
- Eric Bana as Con Petropoulous, Tracey's new husband, an accountant and amateur kickboxer
- Anthony Simcoe as Steve Kerrigan, the second-oldest son and an apprentice mechanic
- Wayne Hope as Wayne Kerrigan, the black sheep, who is serving time for armed robbery but is loved by his family regardless
- Tiriel Mora as Dennis Denuto, a bumbling small-time lawyer who previously failed to defend Wayne on his charge
- Costas Kilias as Farouk, the Kerrigans' neighbor
- Bud Tingwell as Lawrence Hammill QC, a retired barrister who comes to the Kerrigans' aid by representing them pro bono
- Les Toth as Heavy at Door, a local hoodlum who threatens the Kerrigans at their house
- John Flaus as Sgt. Kennedy, a local police officer
- Tony Martin as Adam Hammill, Lawrence's son (brief, mostly non-speaking cameo)
- Larry Emdur appears as himself (at the time, Emdur was host of the Australian iteration of The Price Is Right)
- Ian Ross appears as himself (at the time, Ross was a Channel Nine newsreader)
- Bryan Dawe appears as the lawyer Ron Graham
- Robyn Nevin appears as the Supreme Court Judge
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