Lady Ferocity by Kate Archer

He considers her eccentric, she thinks him smarmy, the ton finds them a well-suited pair of lunatics.

Lady Felicity Nicolet, known affectionately to her intimates as Ferocity, has had the privilege of being the eldest of the Duke of Pelham’s daughters. She has been the leader of the pack, and she and her six sisters have grown up isolated in the Yorkshire Dales under the wildly unsuitable tutelage of their unconventional father and rather original housekeeper.
Felicity’s father has gone along happily, convinced every idea that arrives in his head must be acted on, imagines himself hilariously funny, considers the niceties of society other people’s problem, and does not hesitate to tell a bald-faced lie when it amuses him. He leaves a trail of offended people behind him wherever he goes, including Mr. Percy Stratton’s father.