Emma Thompson vowed to use adult humour in the NANNY MCPHEE movies as a tribute to her late father's quirky children's show The Magic Roundabout.
The British actress adapted the Nanny MCPhee stories from Christianna Brand's Nurse Matilda books and they have become firm favourites for kids, with the 2005 original grossing $122 million (£76 million) at the international box office.
Thompson confesses she took inspiration for the film - as well as the current sequel Nanny MCPhee and the Big Bang - from her writer/producer father Eric, who courted controversy with his scripts for the U.K. version of The Magic Roundabout.
And the star admits she always aims to write stories which make herself laugh first and foremost.
She tells British chatshow host Jonathan Ross, "(Nanny MCPhee) is an homage to my dad and to The Magic Roundabout and to the fact he'd done these funny cartoons for kids and he'd get letters from mothers saying, 'How dare you use phrases like this for children, they'll never understand it,' and he said, 'Well, why would you write differently for children? They're just children who haven't lived as long as we have, what's the point in talking down to them?'
"I have to write something that makes me laugh that I like and then hope everybody else is going to like it."