Since Hermione is "princess-obsessed," her mother, Helen, was planning on bringing her daughter to get a glimpse of the festivities regardless. But when she was researching online where best to view it, she discovered she could apply for tickets to an area reserved for disabled guests.
Hermione suffers from Prader-Willi syndrome, a genetic disease that prevents her from walking or standing for long periods of time.
On March 31, two weeks after applying for the tickets, the Suttons received good news via an email.
"I thought nothing of it, but then lo and behold we got an email saying we'd been selected to go into this special disabled enclosure," Helen told the "Today" show. "So we were absolutely thrilled."
Hermione has her dress -- and tiara -- already picked out for the event. And Helen is just as excited about attending the wedding as her daughter is.
"I have to say I am a big fan of the royal family," she told The Guardian. "We had a party for the Queen's Golden Jubilee and went to Diana's funeral. Hermione is a huge fan of princesses, of course, so we're getting right into the spirit of it all."
Not as excited about the royal wedding is Hermione's father; her 4-year-old sister, Tabitha; and her 9-year-old brother, George. They have made alternative plans.
"[My husband] Mike is completely not bothered by the whole thing," said Helen. "He plans to take everyone else to Legoland, as he is convinced it will be empty that day."
Still, Helen and Hermione have planned to video-record the day as well so they can share the experience with the rest of the family when they get back home.
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