Amanda Gibbons-Caire may never have met the Whitehead family, but she will shave her head for them anyway.
At 2pm this Sunday, the Murray Bridge woman will submit herself to the clippers as part of Cupid's Undie Run, a fundraising event for the Children's Tumour Foundation of Australia.
She has already raised more than $1200 towards the cause.
The funds will go to research into neurofibromatosis, an untreatable condition which causes tumours throughout the nervous system, including on the spine and in the brain.
They will also help support families living with a dignosis, including the Whiteheads.
School-aged brother and sister Jackson and Shelbie both live with the condition.
Ms Gibbons-Caire met their mum Kirsty through her makeup and skin care business, and chats with her on Facebook every day.
But Sunday will be the first time they have met in person, despite both living in the Murraylands.
"Her story inspires me," Ms Gibbons-Caire said.
"It's a really special, close bond me and Kirsty have.
"They're a pretty special family ... I don't need to meet them to know they're lovely people."
The connection they share is built not just on friendship, but on the shared experience of family heartache.
Ms Gibbons-Caire lost her brother Joshua to a medical condition.
"To think of someone going through that with two of their kids absolutely breaks my heart," she said.
She said she was nervous and excited at the prospect of losing her hair, but thought it would feel liberating to do so for such an important cause.
"My hair will grow back, but we don't know what chances these kids have," she said.
"Shaving my head's not going to find a cure, but it could maybe, somehow, prolong someone's life and make more quality of life."
- Donate: Search for "Amanda Gibbons-Caire" at cupidsundierun2019.everydayhero.com.
- Participate: From 9.30am Sunday on the Esplanade, Glenelg; tickets $70.