PRINCESSES Elsa and Anna, from Disney's Frozen, will join the fight to ensure two youngsters can spend Christmas with their cancer-stricken brother.
William Jones, six, has a brain tumour and will travel to America for special treatment as soon as he is fit to fly.
But there is not enough money to ensure his brothers Sammy, two, and Bobby, 13, can travel with him, meaning the family faces being separated for Christmas.
Now residents in Charlwood, where the family lives, are holding a fundraising day to help send Sammy and Bobby to the USA as well.
Terry Chellew, one of the event organisers, said: "Funds don't allow William's two brothers to travel with him so he and his parents face at least three months without them.
"They want a family Christmas and, additionally, funds are needed for long-term accommodation and post operative care."
William's tumour was discovered in October. An operation removed part of it, but he requires therapy which will be provided in America.
So far, the community has raised more than £18,000.
The Wishes for William Day will take place on Saturday, from 2pm, at Charlwood Village Hall.
Characters from Frozen will unite with Father Christmas at the event, which will also feature a raffle featuring an England football shirt as a prize.
To donate, visit www.youcaring.com/medical-fundraiser/es-for-will-s/262671