According to Yes by Dawn French

The Foreign Land of the Very Wealthy - otherwise known as Manhattan's Upper East Side - has its own rigid code of behaviour. It's a code strictly adhered to by the Wilder-Bingham family.
Emotional displays - unacceptable.
Unruly behaviour - definitely not welcome.
Fun - no thanks.
This is Glenn Wilder-Bingham's kingdom. A beautifully displayed, impeccably edited fortress of restraint.
So when Rosie Kitto, an eccentric thirty-eight-year-old primary school teacher from England, bounces into their lives with a secret sorrow and a heart as big as the city, nobody realises that she hasn't read the rule book.

Because after a lifetime of saying no, what happens when everyone decides to start saying . . . yes?