Can't really tell from photos but don't see swollen. Maybe a joint could be enlarged?
12 years could have arthritis. Maybe someone can suggest things for older birds like diet supplements.
We are not vets so we can only generalize.
Maybe since you can get a photo pf the right leg & the left leg together so any difference can be more easily seen.
Your bird is elderly & we don't want them to be in pain. If they are favoring a leg or foot then most likely its is bothering them.
Sad your parents are putting you & your bird through this so do your best.
12 years could have arthritis. Maybe someone can suggest things for older birds like diet supplements.
We are not vets so we can only generalize.
Maybe since you can get a photo pf the right leg & the left leg together so any difference can be more easily seen.
Your bird is elderly & we don't want them to be in pain. If they are favoring a leg or foot then most likely its is bothering them.
Sad your parents are putting you & your bird through this so do your best.