What's the Name of That Book??? discussion

This topic is about
House of Shadows
SOLVED: Children's/YA
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SOLVED. YA Fantasy book start of the 90’s, family feud, paper Dolls and imaginary dog. [s]
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He is looking for a YA book he read in the early 90’s.
The MC is a Girl and has a little brother, possible named Tucker that has an imaginary dog named Digby.
The kids are going on vacation to their old aunts house and she had a couple of cats .
He remembers the House has a large library with some indian beads and the aunt makes a comment about Reading Them.
The House has an old feud between 2 families (maybe named Kimble and Kidle)
The girl find some paper dolls that should look like victims for the conflict and something with souls.
Then he remembers a tunnel, a basement where something Once happened to some kids and maybe a guy named Jacobus. And he also remembers an indian in the book.
I hope this is enough for someone to remember. Thanks in advance :)