Howl’s Moving Castle Series- 3 books
Howl’s Moving Castle is by Diana Wynne Jones
It talks of a young lady Sophie, who happens to be the first child of the three children in the home. She and her sister Lettie are from one mother who passed on while Sophie was just two years old. Her father married a blonde pretty woman (Fanny) who was a shop assistant and gave birth to the last born called Martha.
Fanny was nice to all the children and never abused any of them, but the problem came from the two young ones who couldn’t stand each other. And as that story was going on, a witch started her plots of antagonizing the village and also threatened the life of the king and the king’s daughter and new drama sprang up.