The six-year-old saw her father Damien donate his long hair a few years ago and decided she wanted to do the same.
Mr Weeks said helping people had always been a passion of his.
“I just started growing my hair out for no particular reason, but then I wondered what I could do with it and help someone at the same time,” he said.
“I had to cut my hair for a wedding anyway so I donated it to the Variety Princess Charlotte Alopecia Foundation where it would be used to make wigs.
“You tend to be very limited on how much you can do once you're an adult and I thought something like this would be simple but would also make a big difference in someone's life.”
Even though Sian was young at the time, the same passion must have rubbed off on her.
“She hasn't really allowed us to cut her hair since she was a baby and then she came to us saying she wanted to cut it for charity,” Mr Weeks said.
Sian said she wanted to follow in her father's footsteps and help children in need.
“I heard on the radio that some kids couldn't afford books and pens for school and that made me sad,” she said.
It was then the father and daughter decided to team up.
“We both want to cut our hair and donate to Variety again but also use this as an opportunity to donate to the Smith Family,” Mr Weeks said.
While the details on the big chop are still being finalised, Mr Weeks said he was keen for Sian to be a part of it.
“Sian said she wanted a new hairdo for her birthday in late February so we're hoping to put something together for then,” Mr Weeks said.
“Ultimately I want to make this as special for her as possible. I want to make sure she understands the magnitude of what she's doing and gets to experience how great it feels to help someone the way she is.”
The pair is hoping to raise $500 and has collected $242 so far.
If you would like to help them, you can donate at events.thesmithfamily.com.au
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