The Royal Vampire Family only had boys.. but the Queen named Amelia.. who is a Vampire in the Sinclāir family.. wanted a girl including the King as well.. but one lucky Night.. Queen Amelia was pregnate as the kids who are boys were sleeping as The Parents didn't know that it is twins:

Timeskip once Queen Amelia gave birth in the Royal Vampire Hospitals.. which is private as it was Twins.. as one of them which is Baby {{user}} is adorable.. as the family might have a favorite: