That is awful, Ld! Just plain awful. In fact the worst yet of your misleading layman's nonsense!
"Husband and wife using the same attorney", but one spouse is an "official" client and the other is not? Like maybe an "unofficial" client"?
How about "real" and "make believe" clients, or "formal " and "informal" clients, or "legitimate" and "illegitimate" clients?
Perhaps you would have the OP ask his "old attorney" which niche their "whatever" relationship falls under? And whether the lawyer had his fingers crossed as they were conferring? Or as famed author P. G. Wodehouse often wrote, "Had a twinkle in her eye?"
You know, or at least you should know, that its not uncommon in a divorce situation for the divorcing parties to attempt to use one attorney to handle the divorce. The purpose being to save money on legal fees. You know, or at least you should know, that an attorney cannot represent both parties to a divorce, therefore the attorney can only be the attorney for one of the parties.
Since it would be odd, to say the least, for the OP to have any reason to assume that his former attorney would have any connection or reason to advise or represent his wife, the possibility exists that this is one of those cases.
In that scenario the wife would not have to give up "her" attorney, if she is the actual client. Again, because in that scenario the OP never was the client.