Desperate for a name or Author

[tosethresee]

I recently remembered a fantastic fantasy series i read a while ago, but alas i cannot remember the title of any of the books, or the author. If you can figure it out from what i can remember i would be eternally grateful.
-The main characters were twins, a boy and a girl. The girl could heal living things with her touch but i dont recall the boys ability (if any).
-The girl brought a baby back from the dead in a small village she was visiting. The baby has no soul and fed on the life essence of anything it touched (exact opposite of the "mother". This baby grew larger as it fed on lives and soon began slowly following the girl her brought her to life, thinking it was her mother.
-They acquire a magic crown. The sister puts it on, her thoughts turn bad and she accidentally resurrects an army of previously petrified creatures. A man who can influence animals takes control of them and uses them to attack the castle the twins reside in.
Im desperate, please help!

 

[sparkchaser]

I think I know this series!

Stand by whilst I get the name of it.

 

[sparkchaser]

Is it The Bone Doll's Twin by Lynn Flewellyn?

 

[tosethresee]

That looks like a fantastic book, but it is unfortunately not the one i was looking for. Ill just rattle off some more things i remember:
-There is a part where the twins visit the north of the island to search a castle (for the crown im pretty sure). The sister strokes an old, frozen fur hanging in a room and it becomes soft and supple again.
-The guy who lives in the castle is demented, he can control animals and he does things like make birds divebomb the ground until they die.
Thankyou for your swift reply

 

[sparkchaser]

Damn. I thought that was it.

Sorry I was unable to help.