"The Incorrigible Children of Ashton Place: The Mysterious Howling" by Maryrose Wood

This is an enchantingly silly and endearingly sweet book. I read it aloud to my kids over the past month or so, and we all enjoyed it so much, we got the next book out of the library as soon as we returned this one.

In it, a fifteen-year-old governess undertakes to humanize three children who were literally raised by wolves in the forest outside a rich person's house.  The rich people have taken the children in, more or less grudgingly as the case may be, and they've hired this governness...