Penniless Brides of Convenience
Three orphaned sisters, Eloise, Phoebe and Estelle, come to live with their Aunt Kate, ‘conveniently’ married to their Uncle Daniel, and not much older than themselves. With Kate as a shining example of a convenient marriage which works (or does it!) the three sisters make their own extremely unconventional marriages.
And coming in January 2020, Book 4, The Inconvenient Elmswood Marriage