I would not be comfortable with this and I would bring it up no matter how uncomfortable it would seem.
I am not trying to guilt you by any means hun - but I wouldn't have left without asking who he was and what he was doing there - you are paying her for a service, you are the client.

It may be a bit awkward but if you ask upfront, it will leave the door for the future - otherwise you are defeating the purpose of having your DS in FDC by worrying about him