Ok so. How did Lisa and Drac actually get married? A chutch wedding is right out and its not like they could go to a registry office. Especially as people seemed to consider him Lisas canadian boyfriend more than anything.
Maybe that's why Dracula sometimes has a chapel in his evil vampire castle. In SotN it even has a confessional.
Ohey so thought that I need to share with as many people as possible: Spoiler: all the S2 spoilers Alucard has probably not met either of the Devil Forgemasters, since Dracula met both of them while he was on walkabout, got home after Lisa died, immediately got in a fight with Al, and then went out and brought them back to his castle. All Hector's zombie pets were still in his lab when the end of S2 went down. Please imagine Alucard wandering around the castle looking for any remaining horribly lethal messes... and getting tackled by a very friendly, very excitable, very bored and lonely zombie pug. He does not know his dad recruited a necromancer Disney princess. "WTF, Dad?" Alucard thinks.
Brings another theory like a cat with a dead thing: Dracula and Isaac in (show) canon are basically failrails. They support each other but unfortunately what they support is each others unhealthy distorted thinking.
Silly headcanon: Dracula tried to pull the "I am your husband, obey me" card exactly once. She was having none of it.