What the law does require is, if asked for public access, that you give what the dog does to mitigate your disability, but you do not have to tell them what your disability is, nor should you, for a couple of reasons.
For example, you might say that your dog is used for balance, but you wouldn't have to tell them that you have MS.
I'm assuming, though, that Ds's dog is an ES dog. (Emotional support.)
Either way, be sure that he knows that no one can register his dog as a SD, so he should beware, especially if they are offering some type of 'official' paperwork, or asking for a fee.
I'm really sorry, too, especially about being around her family. Darn.
How frustrating about the email and limited texts!
Love All Life; Thank You For Posting! :)