<P> There, Nanny McPhee and the boys ask Cyril's father Lord Gray, who is very important in the War Office, what has happened to Mr. Green . At first Lord Gray sneers at Norman's disbelief at his father's death, but after Cyril blurts out that he knows his parents are getting a divorce, Lord Gray checks what has happened . While he is gone, Cyril tells Norman that he and Celia have been sent away because their parents will be splitting up, and Norman asks where Cyril and Celia will live . When Cyril replies "with Mum, I suppose, not that it makes much difference, she only ever really sees us when she wants to show us off", Norman tells Cyril that he and Celia are welcome to live on the farm with the Greens . Lord Gray returns and tells Norman that his father is not dead, but is missing in action, and that there is no record of a telegram being sent to his mother . After the boys leave, Norman deduces that Uncle Phil forged the telegram . </P> <P> While the boys were at the War Office, Megsie, Celia and Vincent were trying to stop Isabel from signing the papers and selling the farm . Just as Isabel is about to sign the papers, a German pilot accidentally drops a huge bomb; it shakes everything but does not explode and is left sticking out of the barley field . When Nanny McPhee returns with Norman and Cyril, Norman accuses Phil of forgery, which he admits to, and Isabel handcuffs him to the stove . The children go out to watch Mr. Docherty dismantle the bomb, but he falls from the ladder . Megsie takes over, and succeeds with the help of the other children and Nanny McPhee's jackdaw, Mr. Edelweiss . After Nanny McPhee helps to harvest the barley with a little magic, saving Phil from Mrs. Biggles hitwomen in the process, it is revealed that old Mrs. Docherty is in fact baby Agatha from the first film and that Nanny McPhee has been staying with her . As Nanny McPhee walks away from the now happy family, the children and Isabel chase after her, only to see Mr. Green, in army uniform with an injured arm, making his way to them . He runs to his family and they embrace . </P> <Ul> <Li> Emma Thompson as Nanny McPhee, the magical nanny who changes the lives of the Green and Gray children . </Li> <Li> Maggie Gyllenhaal as Isabel Green (née Carrington) the frazzled mother of Norman, Megsie, and Vincent . </Li> <Li> Rhys Ifans as Phil Green - Norman, Megsie, and Vincent's uncle who tries to sell the farm because he gambled it away at a casino . </Li> <Li> Asa Butterfield as Norman Michael Green, the eldest of the Green children . </Li> <Li> Lil Woods as Megsie Charlotte Green, the middle and only girl of the Green children . </Li> <Li> Oscar Steer as Vincent David Green, the youngest of the Green children . </Li> <Li> Eros Vlahos as Cyril Sean Gray the spoiled cousin of Norman, Megsie, and Vincent . He becomes kinder throughout the film and makes friends with Norman . </Li> <Li> Rosie Taylor - Ritson as Celia Rosa Gray the other spoiled cousin of Norman, Megsie, and Vincent . She also becomes kinder throughout the film and makes friends with Megsie . </Li> <Li> Maggie Smith as Agatha Rose Doherty (née Brown), the owner of the shop at which Mrs. Green works . She is baby Aggie from the first film grown up . </Li> <Li> Ewan McGregor as Rory Green, Isabel's husband, Phil's brother and the father of the Greens, away fighting in World War II . </Li> <Li> Ralph Fiennes as Lord Gray - Cyril and Celia's father, who is very high up in the War Office . </Li> <Li> Sam Kelly as Mr. Algernon Doherty - Mrs. Doherty's husband, who is an ARP (Air Raid Precautions) Warden . </Li> <Li> Sinead Matthews as Miss Topsey - a henchwoman of Mrs. Biggles, the woman who owns the casino at which Phil gambled the farm away . </Li> <Li> Katy Brand as Miss Turvey, the colleague of Miss Topsey . </Li> <Li> Bill Bailey as Farmer MacReadie, the farmer who buys the piglets from the Greens . </Li> <Li> Nonso Anozie as Sergeant Ralph Jeffreys - the guard at the War Office, and a former charge of Nanny McPhee . </Li> <Li> Daniel Mays as Blenkinsop - Cyril and Celia's chauffeur . </Li> <Li> Ed Stoppard as Lieutenant Addis, a coworker of Lord Gray . </Li> <Li> Toby Sedgwick as an enemy plane pilot . </Li> </Ul> <Li> Emma Thompson as Nanny McPhee, the magical nanny who changes the lives of the Green and Gray children . </Li>

Who plays the mother in nanny mcphee and the big bang