Thanks to the Netflix series as well as Shonda Rhimes (Greys Anatomy as well as other notable shows), people are in love with this series. Here are the books in order as well as a link to a family tree.
Book 1: The Duke and I
Book 2: The Viscount Who Loved Me
Book 3: An Offer From A Gentleman
Book 4: Romancing Mr. Bridgerton
Book 5: To Sir Phillip, With Love
Book 6: When He Was Wicked
Book 7: It’s In His Kiss
Book 8: On The Way to the Wedding
For a Family Tree, click on this link.