Oh yeah! I should have remembered that Once a Thief was Canadian. That's the one Lianne wrote fic for that you liked, right?

About the family Bridgerton through several generations of marriage and children
It's actually only one generation (the Baroness had 8 children! And they'll never forgive her for naming them alphabetically). It's a series of romance novels but if you pretend the ton is vampires, even that last bit fits!