Sir Philip's folly - M.C. Beaton

Sir Philip Sommerville is quite the antique, but not too old to bring home a paramour: fat, vulgar and greedy Mrs Budge who, the other poor relations are agreed upon, has to go. And then there is Lady Carruthers, a highly rouged widow who passes off her grown daughter, Arabella, as a school miss while setting her own cap for the young Earl of Denby, despite the fact that young Arabella is quite smitten with the dashing golden-haired earl! So once again it is up to the other poor relations to straighten out the course of true love...