The Penderwicks by Jeanne Birdsall

Birdsall, Jeanne.
THE PENDERWICKS : A SUMMER TALE OF FOUR SISTERS, TWO RABBITS, AND A VERY INTERESTING BOY
New York : Knopf, 2005.
IL 3-6, RL 5.6
ISBN 0375931430

When our story begins, Batty is still only four years old. Rosalind is twelve, Skye eleven, and Jane ten. They're in their car with Mr. Penderwick and Hound. The family is on the way to Arundel and, unfortunately, they're lost.
"It's Batty's fault," said Skye.
"It is not," said Batty.
"Of course it is," said Skye. "We wouldn't be lost if Hound hadn't eaten the map, and Hound wouldn't have eaten the map if you hadn't hidden your sandwich in it."
"Maybe it's fate that Hound ate the map. Maybe we'll discover something wonderful while we're lost," said Jane.
"We'll discover that when I'm in the backseat for too long with my younger sisters, I go insane and murder them," said Skye.

Rosalind, who was sitting in the front seat with Mr. Penderwick, turned around and gave Skye her oldest-sister glare. It wouldn't do much, Rosalind knew. After all, Skye was only one year younger than she was. But it might quiet her long enough for Rosalind to concentrate on where they were going. They really were badly lost.

It’s vacation time, and the Penderwick sisters and their dad will be staying in a cottage in the Berkshires for the summer. They do manage to find it, but Arundel isn’t quite the cottage they were expecting. It’s located on a grand estate, with a mansion next door. Add a mysterious boy glimpsed in a window, a handsome young groundskeeper and a bad-tempered bull and things are bound to get interesting! Join the Penderwick sisters for a bit of adventure, a bit of mystery, a bit of growing up, and a lot of fun. (New Hampshire Great Stone Face 2007)