I too thought that Queen Elizabeth (Mum) was coronated at the same time as George VI.
She was, and was Queen Consort. However, I believe you are not Prince Consort if married to a Queen, as this titile was specifically created by Queen Victoria for Prince Albert, and has not been used since his death. Hence speculation in the British Press some years ago, that our Queen was going to announce that the Duke of Edinburgh was to be Prince Consort, but it came to nothing.
As to the term "Commoner", in this case it is not rude. To call someone "Common" however is generally seen as being so. In the UK, (I am a a British poster) we have the Lords and Commons in Parliament. The Lords are divided into the Lords Spiritual and Temporal, i.e. Bishops and other sorts of Lords, but the other sort are not necessarily moneyed landowners, some time ago, one of them was making a living as a dentist.