Just your typical ‘move into an old creepy house, weird stuff starts happening, one of the kids gets blamed, and then they find a book that explains the existence of fairies/faeries/fey which solves their problems... while at the same time causing many more problems’. Happens every day.
We don’t get to him or his perspective about what’s going on. The sisters are typical: the good sister who takes care of things and the bad sister who hangs with the wrong crowd.