Apologise for not being able to share more information, state that you are unable to discuss the specifics of George’s illness without him present, but reiterate some general points which were discussed with George and Caterina present in the consultation.
This approach is still in alignment with George’s wishes, but is also not dismissive of the important role of Caterina and the major life changes she may need to make as his primary carer. Reiterating general points that have already been discussed in the presence of George is not undermining his privacy/confidentiality as it has already been shared in his presence.