Hi Mrs. Smtih,
Welcome to the Forum.
'Her parents were King George V1 and Queen Elizabeth, who died in March 2002'.
The more I read this sentence, the more confused I become. It looks to me as though the writer means that both parents, George and Elizabeth, died on the same date. Shouldn't the comma be after King George ? Please advise.
Yes. I'd put the comma here. 'Her parents were King George VI, and Queen Elizabeth who died in March 2002'.
I'd also consider putting a comma after 'Elizabeth', because the information is just extra information about Elizabeth and not really needed to identify her. However, I think that would seem like too much fussiness in this example.
Best wishes, Clive