Why did the Doctor take all my Grandmas childrens' name?

He may have wanted the names to comply with US federal guidelines of who he is allowed to talk to. Calling her Mum makes me think you are not US. But it still probably has to so with who he can talk to. You need to ask the Dr. Maybe your uncle James is a little crazy and you don't want him involved in decisions regarding your mothers care. So just ask the Dr. Also here in the UD most Dr and hospitals like 1-2 people to talk to and relay the information the everyone. else. We just don't have time to talk to 21 other family members. So 1-2 family members are usually the ones the patient chooses so decisions can be made.