Little Men by Louisa May Alcott

With two children of her own, and twelve rescued orphan boys filling the informal school at Plumfield, Jo March (presently Jo Bhaer) couldn't be more joyful. But despite the warm and loving help of the full March family, boys have a propensity of getting into the rub and there is a bounty of inconveniences and experiences ahead. The third book about the March family and their friends.