My worker never signed the letters either. When I called, I first just spoke to the operator who looked up my workers name and extension, then transferred me. I don't think I ever for a single piece of paper with a
Any name in it. I think that may be there looking I'm case they change workers randomly or something.
Anyway, Good luck. Oh, I don't think they will want your dad to actually sit in on the eval. They generally like to do that one on one.