Any more historical romance series with big families?
ooh I feel like family sagas are kind of the backbone of historical romance— historically speaking, people were having more kids back then, the fantasy/fictional part is that most of them survive to adulthood, and then from a writing/plot perspective, it's easy to introduce future heroes/heroines and start building out their characters and plot when they're siblings or closely related, therefore (probably) in close proximity to each other.
Maiden Lane series by Elizabeth Hoyt: In a series of 12 books, the Makepeace sibs (lower middle class, of unidentified dissenter sect, focused on good deeds... other than Asa lolol) has 4 heroes/heroines among them, the Batten siblings (aristocratic family headed by the Duke of Wakefield) have 3, and the Reading and Greaves families have 2— you get a really great sense of the individual family dynamics and all their intersections.
The Hathaways series by Lisa Kleypas: 5 siblings from a middle class background unexpectedly elevated to high society when the brother Leo inherits a viscountcy— all close knit but kind of a hot mess between mother hen Amelia, chronically ill Win, drunk and depressed Leo, and bby kelpto/animal lover Beatrix. Oh and there's Poppy.
Heart of Enquiry series by Grace Callaway: 6 siblings (though Ambrose and Harry's books aren't in this series) from a lower middle class background who join the ton after big brother Ambrose marries wealthy widowed baroness Marianne and they're such a fun time. I feel like some of them definitely have Hathaway counterparts (I'd say Amelia —> Emma and Win —> Thea for sure), and they also have an honorary sister in Marianne's daughter Primrose.
Sin for all Seasons series by Lorraine Heath: The Trewlove siblings are foster siblings all brought to Ettie Trewlove, a child farmer (a woman who is paid to care for unwanted children but sometimes they would kill the children instead). Ettie ends up raising these kids as her own, and while their bastard status makes them outsiders, they slowly but surely crawl their way into the ton with their *business smarts* (Mick is a legitimate ish businessman, Gillie owns a tavern, Aiden owns a pleasure club, Fancy owns a bookstore)... among other things.
MacKenzies series by Jennifer Ashley: 4 hot Scottish aristocratic brothers with a boatload of daddy-related trauma headed by deeply misunderstood dbag Hart, Duke of Killmorgan. The others are the horse-y one, Cameron, artist Mac, and polymath Ian.
Last Chance Scoundrels series by Eva Leigh: All 3 books have a Ransome sibling and 2 have a Kilburn sibling, who are the younger sons and daughter of an earl(?), and the series starts with Finn and Kieran Ransom convincing Dom Kilburn to dump their sister Willa at the alter, and after Finn and Kieran get their HEAs, they conspire to bring Willa and Dom back together.
Pennyroyal Green series by Julie Anne Long: Heavily features the long-time rivalry between the Redmond and Eversea families as a bunch of siblings in both prolific families find love. There's a whole local legend about one Redmond and Eversea are destined to break each other's hearts every generation...
The Beautiful Barringtons by Kathleen Ayers: I'm CONVINCED this is the superior Bridgerton for anyone who wants something Bridgerton-esque; the family is headed by Anthony aka Tony, who becomes Duke of Averell by the end of his book, and then a bunch of his hot mess half-sisters, one foster sister, and one cousin get their own book.
