Jim, you've got to make the decision that is right for YOU and YOUR BIRDS, and YOUR SITUATION. Everyone has to make this decision based on what is right for themselves, and though you can listen to the ideas/advice of other, don't ever let anyone make you feel guilty or like you're a bad parront because you clip your bird's wings. That's not fair to anyone, and even though it's good if you are able to let your bird's be fully-flighted, there are a lot of situations where at least a temporary wing-clipping is necessary...
And that's just it, wing-clipping is totally and completely painless and temporary, and when done correctly their wings will grow back fully in a matter of 2 or so months...So there is nothing wrong with taking advantage of the time that they are clipped and encouraging them to become closer to your brother, who they now live with in his house. There is a huge difference between encouraging your birds to spend time with your brother while they are clipped and actually "forcing" them to do so...I'm sure that if you clip Beebs wings temporarily and your brother makes an effort to spend more time with him and interact with him while he can't fly away from him, and he gets Beebs on his finger and Beebs freaks out and it's obvious that he doesn't want to be there and is stressed about it, that neither you or your brother are going to "force" him to stay there...that would be "forcing" your birds to interact/spend time with your brother...And that's not at all what you're talking about doing, nor would you ever do...
And anyone on this forum who has known you for any length of time knows just how much you love your fids and what great care you take of them, and also knows that you would never do anything to hurt them, scare them, or "force" them to do anything that they are obviously not comfortable with...
****As long as you make sure that your CAV only clips the outermost 5-6 Primary Flight-Feathers and doesn't go into the Secondaries at all, so that Beebs will be able to glide to the floor/glide across a room but not gain any altitude, and they do BOTH WINGS, then it's a painless, safe, and temporary wing clip that will grow back in fully in around 2 months or so. Nothing wrong with that, and nothing wrong with your brother spending extra time with Beebs during this time that he can't go flying away from him constantly, because we all know that chasing a bird around the house is the worst thing you can do when trying to build a bond with them...
You guys are now in a totally different situation and position than you've been in, you're living with your brother, in his house, and your brother obviously has taken a much more active role in your bird's lives. So I actually think it's quite important that your brother does try to form a stronger bond with both Amy and Beebs and does try to get both of them comfortable with being handled and interacted with by him, because not only will your brother now be helping to care for your birds since they're living with him,
but if you have any future health-issues that require you to stay in the hospital again, your brother is going to be the one who is caring for both of them 24/7 while you're in not there, so he needs to try to build a bond with them (I hope that never happens to you again). And anyone who has ever spent time hand-taming birds knows that it is much easier, much more productive, much less stressful for the bird and for you, and happens much more quickly if the bird's wings are clipped so that they can't constantly keep flying away from you...Does that mean that you're "forcing" the bird to do anything they don't want to do? No, absolutely not, as long as you respect it when the bird has seemingly had enough, and you don't physically make the bird do anything they outwardly and obviously don't want to do...which you nor your brother would ever do...Just because a bird is much more likely to stay perched on someone's finger and listen to them talking to them, to accept scritches more willingly, etc. when their wings are clipped does not mean that you're doing anything "forceful" at all; I myself believe that that situation allows the bird to get to know the person and allows them the time to realize whether or not they actually like the person, rather than the frantic and pretty-much automatic "flying-away" from them over and over and over again...And if Beebs still doesn't really like to spend time with your brother or have direct-interaction with him, then at least you'll know that and have to respect it. Nothing wrong with that...
There is a significant difference between "encouraging" and "forcing", as well as "giving a bird the chance to step-up for you and get to know you" and "physically keeping a bird against their will"...And as long as you respect the boundaries and the obvious outward wants of the bird, then there is absolutely nothing wrong with using a wing-clipping to help facilitate bonding and training...