Implications of introducing a new bird

It would be necessary to quarantine the second parrot for 30 days before introducing her to the existing parrot. After a complete vet check, that time could be reduced. Close supervision will be necessary when introducing any two parrots. Extra vigilence would be needed in your case because the blind bird is more vulnerable. Two parrots may be more vocal than one alone. There is a good chance that two parrots housed together will form an exclusive bond and won't want to interact with humans any longer. Aggression is a possibilty.
Bringing in a mate for Yoda wouldn't ensure that he would be any happier; the opposite is always possible. "First parrots" often resent the presence of another parrot in the home. Something to keep in mind.

So a quick update as the blind parrot has arrived a few days back. She is making really good progress, although arrived very thin and very scared and bitey. But so far so good, we will see how she settles.

Many thanks. Amazingly Mint has just changed completely and stopped biting all together. My 3 years old daughter decided that she was her friend and walks around the house with her on the shoulder, something that I would not allow with Yoda who can and will bite sometimes other people that are not me. Mint looks super confident and it happened all so fast. I have just been giving her formula from the syringe and she allowed me to pet her head. And then she just decided to trust us I think! That is an adult wild bird and blind so I was really surprised. She will 'feel' with her beak until she finds my hand and step up on it. She also flies and I kind of put my hand up in her way so she can land there. It is all quite surprising. She is in Yoda's aviary and the two birds essentially ignore each other for now, they will just answer each other's calls quite loudly but that is all. During the day they spend many hours in the house with the children and I, just hanging out and playing on the table, and it is quite a joy for all of us.

Hello,

I thought I would give a little update down the line which may be interesting to those considering adopting multiple quakers. So as a summary, I first adopted Yoda, an imprinted male quaker parrot found very weak in the street (with no identification), then came Mint, a wild adult female quaker that became blind after a collision with a car and following that spent a few month at the house of the person who found her but could not keep her long term. Finally arrived shortly after Moss, sex unknown, a wild baby quaker fallen from the nest with severe paralysis in both legs.
All this happened from April, and since that I can say things have gone really well. Yoda and Menta had arrived with severe plucking, and I wish I could show you photos of them now, they have perfect feathers and very long tails! Moss has recovered slowly from his paralysis, he can stand and walk (with a slight limp), but cannot perch very well and cannot grab his food in his foot, so he has to eat from something flat. Yoda, who arrived first, had immediately bonded to me and was kind of 'needy' in terms of attention. Although it took him months it seems he has now realised he was a bird, and is bonding with Menta(they sleep together and he preens her sometimes), but they are not an item yet. Menta is the dominant bird, and Moss is the underdog. The three live together and there are no fights, although Moss definitely gets his loving from me rather than the others.
In terms of how they relate to me (mostly) things are good in that they will come to me if I call them (most of the time) I can pet them and they never bite me in or outside cage. Yoda is great at stepping up, Menta is alright but I need to work more with her, with Moss I haven't really made progress on stepping up because his recovery from paralysis has been so slow. Definitely the relationship with Yoda changed after the others arrived and also when I started making him wear pants he lost a bit his trust in me. He does not mind me but does not have this super strong need to be with me as before. He is happy to chill on my shoulder or on my computer (like now!) whilst I work, but does not crave contact so much.
Unfortunately because of COVID disruptions the aviary I have ordered has not arrived yet, so they live in a cage (one of those big parrot cages), and spend the mornings flying in the house. Both Yoda and Moss wear diapers and I can say that, although I did not do it well at the beginning and could have taken it slower to make it easier on them and myself, now it is a rather good success. Not 100% great as the moment to put them on can still feel a little unnatural to them and they tense up, but other wise good. Menta however will have none of this, and just tears the thing apart. As a wild and blind adult I decided to let her be not to damage our relationship, and so she is diaperless. But her blindness means that she only flies between the three places she knows well so it is relatively easy to control the mess.
In terms of diet they eat mostly vegetables, I give them like a whole bellpeper, or chunk of courgette, and other greens and they just destroy it in tiny pieces. Second meal of the day is cold pressed pellets. When they are out in the morning they have treats (nuts, fruit, flaxseed and chia, and bingo! a tiny bit of cheese that drives them crazy).
I have plans to implement a proper training programme with them at some point with clicker and stick, but for now I just keep to our little routine.
I am really happy with them and I would say it is definitely a plus for them to have companionship from their species. It is also good for me although the relationship is different and less 'needy', because I don't have to feel bad that the bird is lonely everytime I am out. One downside is that dear Menta screams a lot. The two other are ok, they can vocalise a bit but no comparison with Menta. I think the combination of being an adult wild bird and the fact she can't see where her friends are drive her to bouts of slightly unbearable screaming. But hey, I love her all the same, it is very special to me that a blind bird has accepted to trust in me and stopped being scared and bitey altogether. Menta is the softest of the three, and my 3 years old daughter's favourite because she never bites and she can carry her around the house (until she is fed up and flies off).

Anyways, just thought I would share our little story because I was quite nervous as a first bird parent to take up the challenge of three quakers in one go!

Wow you are doing great and getting a nice routine going. Thanks for the very informative update and congratulations on doing so well !

Pictures used to be easy with photo bucket but that service isn’t available free anymore and runs on a monthly fee. Just googling I see a website called post image. I am not sure if it works