Currently reading and enjoying False Colours a story of arranged marriage and twin antics. I'm about halfway thru and am enjoying it. Georgette Heyer had a wonderful knack for capturing the comedy of manners of the Regency period as well as writing Austen-worthy love matches. Heyer was a prolific writer and one I'm introducing my mom to ~ which got me thinking about my favorites (she wrote about other time periods but I've only read her Regency stuff):
A Civil Contract: My favorite of favorites ~ the story of a young Earl in need a fortune and an heiress willing to enter an arranged marriage to please her father. The story of friendship deepening into love is lovely and the supporting characters are hilarious.
The Grand Sophy: My first Heyer and still a great favorite; laugh out loud antics and amazing dialogue as an outrageous cousin comes to live with her sedate family in London.
Unknown Ajax: The young man raised by his workman Yorkshire grandfather comes to find out he is the heir of his paternal grandfather; a true comedy of manners as he is 'welcomed' into the family.
The Foundling ~ The Corinthian: (couldn't choose ~ similar plot) An honorable if somewhat bored member of the peerage seeking a bit of adventure sets out on what they believe will be a simple errand with complications and hilarity ensuing.