AA is the one and only Ascended Vampire. He needed to give one drop of blood to Tav to spread his protection from the sun on them. Ascended Vampire is completely Larian's invention. There is no D&D canon on that, so Larian can do whatever they want with it. And devnotes and datamined files clearly state that Tav is his Spawn, not a vampire bride. And also developers clearly state in these files that Tav can't get away from him once tadpoles are gone. It's confirmed. Of course, you are free to have your headcanons, but it's not in canon in any way, so other people aren't required to take your headcanon as truth, when it directly contradicts to what is clearly stated by Larian in the game by AA himself and in their game's files. Other than that, I'm not gonna continue to discuss this topic further, because this thread isn't about it, for me it feels pretty off-topic. Which takes attention away from the main OP's request.
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Rote90, this makes perfect sense and I support it!
Yeah, as far as I've seen, this was the most popular solution for this problem, so I really hope it won't get buried under offtopic posts and Larian will take note on this wonderful way of solving this problem and making everyone happy.