The Sauveterre Siblings are two sets of identical twins, older boys, younger girls. They’re the product of a French Tycoon father and his Spanish Aristocrat wife. They’re rich, gorgeous, and have been media darlings all their lives–except the youngest, Trella. She’s a recluse.
I took it to the next level when Henri’s mistress, Cinnia, accidentally got pregnant with–you guess it–twins! That’s His Mistress With Two Secrets. If you like to read in order, start with Pursued by the Desert Prince.