A/N: In this little AU, Revenge of the Sith ended a little differently. Padmé died in childbirth, and her handmaidens spirited the twins away, blaming the Jedi and Obi-Wan specifically for failing to protect both Padmé and Anakin. Vader's injuries were still as grievous as canon, but he received better care afterwards, and is able to be without his mask for longer periods of time in regular air. Immediately after the advent of the Empire, he found Dormé, who had the twins, and took all three of them, keeping her on as their nurse, with Palpatine's knowledge and permission.
Palpatine/Sidious is less thoroughly Dark, as well, a little more lenient if no less ambitious.
Senator Organa did not get involved in the twins' fate, and remains a wary friend of Anakin/Vader. Senator Danu is also still alive, and an associate of Mon Mothma's.
Order 66 went down as in canon.
Vader retains traces of Anakin.
Legends is irrelevant (except I might cameo Ferus Olin, 'cause I've still got a hopeless crush on him.)
I'm borrowing some names/ideas/OCs from the author DarthRuinous. Will try and remember to note them when they appear.
Bremé is a year younger than the Skywalker twins, and Aulus is a year and a half younger than she is.
There will be chapters that will be part of an established fanon timeline, and some that will be AUofAU. Again, I will try and remember to mark these.
Obi-Wan became a bounty hunter after his failure at first Mustafar and then Polis Massa. Also, he did not see when Anakin burst into flames, having already left to go to Padmé.