Jim Wann, a composer, lyricist, singer and musician has his own knowledge graph but when he Googled himself, he found out that Google lists that his wife is Cass Morgan, the actress. It is not, his wife is Patricia Miller.
Jim Wann went to the Google forums himself and posted a message in the Google Web Search Help forums to ask for help. He wrote, "I have provided feedback now for 2-3 months letting Google know that my wife is listed incorrectly," he said. Jim Wann explained that he is "not married to Cass Morgan," adding "I am married to Patricia Miller."
It is rare to see a person complain about their own knowledge graph, especially if they have some stardom power. But he did, himself, in the Google forums.
I still see the incorrect knowledge graph:
Forum discussion at Google Web Search Help.