My birds are still scared of me!

Budgies, once they got to adult age, are not much for being petted.
The fact that you have a pair that have one another to bond with and Hades has allowed you to pet him is a great step forward and you shouldn't dismiss this. Persephone is telling you that she does not want you to touch her and you should respect what she is telling you by continuing as you are- not touching her.

If I were you, and you want to get a stronger bond with them, I would continue to work with Hades and just work on getting your female to accept you talking to her and being close to her and the cage without her reacting with a bite.
Work on getting Hades to step up if that's what you are wanting to achieve next and she may become curious when she sees what he is doing.

None of my budgies are tame but Skye became quite curious about me when he was first here and would sit on my laptop. once he was with the other budgies and flew over to the laptop, the others all followed.
Budgies are nosey. Just keep positive and concentrate on where you are getting a good response.

Hi and another big Welcome.

Great advice has already been given. I just would like to add some encouragement. You are doing great and so are they, 4 months or so may seem like a long time, but all of you are doing just fine. Slow steps and Little no to expectations of the birds seems to be a good mindset for my son and his bird Tweety.

We have had Mr. Tweety Hawk for 5 or 6 years now, he does not like to be pet in anyway, which at times had frustrated my son when he was younger. My son HAD to learn to respect his birds' personality and preferences. This has made all the difference in their relationship. The trust that grew from not expecting anything back was more than worth the time it has taken.

Oh and I want to add that our other budgie is of an unknown age because she was a rescue. She was not tame and very aggressive when we took her in. In the last few years she has become a different bird, and is now quite the little show off and loves to play with her toys in hopes of getting our attention and of course extra treats.
She is still the boss birdie of the house but definitely not the same "mean little bird" that we got years ago.