First of all thank you for taking them in. They most likely are bonded if they've lived together for years in the same room, so if you can keep them both I'd suggest it, you just need to give them time to adjust to their new home and new people, and you need to learn to read their body language.
That being said, PLEASE do not house these two in the same cage!!! There is a huge difference to being together loose in a house and being locked in a cage together!!! Obviously you can't keep them in the cages you have them in for very long, and I know cages are expensive. But there is a territorial element that these two have not experienced or shared as of yet, and pretty much 100% of the time if you put two birds in the same cage together when they've lived for years loose, there is going to be a huge problem and horrible regret on your part. Their personalities will drastically change as soon as they are locked inside a cage together. That will be their home, their safe place, their place of security. And if you put them in one big cage together, I hate to say it but you are going to come home to a horrible scene in the near future. I'd hate to see that happen to either of these two beautiful birds but also to you and your girlfriend.
Each of these large, intelligent parrots need their own safe spaces, where they can reign over their own food, water, toys, perches, etc. A good example is my Quaker parrot and my Green Cheek Conure. They are out of their cages 95% of the time and they sit, eat, play, snuggle, preen each other, are as close as can be on a huge bird gym I built for them. Never had even a small fight. But if either one of them tries to go into the other's cage for only a minute or two a huge fight breaks out and we've had a vet trip for a cracked beak once already. It's bizarre but it's their cage, their home, and their territoriality takes over, stress and anxiety result, and before you know it you have a severely injured or dead bird laying at the bottom of the cage when you come home.
Please, please save you and your girlfriend the heartbreak that always results from similar situations and but each bird their own separate cage. Better safe than extremely sorry.
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