Oliver Burton of Leicester, England was born with down syndrome. After being in and out of the hospital for years, Burton is fighting his third battle with cancer, given only a few weeks to live.

At the top of his bucket list was to meet the Queen of England at Buckingham Palace. After his local member of Parliament wrote to Queen Elizabeth, the family was told the Queen would be unable to meet with him.

Hoping to still make that dream come true, a social worker from The National Children’s Tumour Leukaemia Cancer Trust wrote to the Actress Helen Mirren, and ask if she could make this small dream come true.

Mirren was delighted to fill this reality, as she was already playing the queen in her West End show. Mirren paid to have Oliver and his parents come see the show, and then come have tea and biscuits backstage after the show. She even had a actor from her show play a butler while she put on the charade.

“She stayed in character for the whole thing. Oliver thought she was the real Queen, and well, that’s good enough for us,” the father James Browne told the UK’s Daily Mail. “She was really lovely. She did the whole thing — had a butler there, was dressed in costume and did it all properly for him,” Browne added.

After Burton had a chat with the “queen” and played around with her corgis, Mirren wanted to make this even more special. Mirren stepping in for the queen knighted Burton and had everyone calling him “Sir Burton” by the end of the night.