Sarah Bearman and Caiden Mathieson have been so moved by people's generosity, they have decided to direct further donations towards brain cancer-related causes.

Ryannan Mathieson, Caiden's sister, said the fundraiser started as a way for people to support the couple following Sarah's glioblastoma diagnosis.

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It has been about two months since the source of Sarah's migraines and headaches was discovered.

Ryannan said Sarah underwent surgery in Melbourne within days of getting MRI results. Sarah then started chemotherapy and radiation treatments.

Ryannan said Sarah had almost completed the course of radiation therapy, but had months more of chemotherapy planned.

Another MRI scan was scheduled in a few weeks to gauge the effects of Sarah's treatments so far.

The couple is back in Bendigo, where Ryannan said people had been supporting them by dropping around food.

"They had to get another freezer to keep all of the food people had been dropping off and supporting them with," Ryannan said.

"There were so many people asking what they could do and they felt a little bit helpless, because what can you do in this situation other than drop off some food?"

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She and one of the couple's friends, Lauren Morris, started the GoFundMe appeal as another outlet for people's kindness.

"We were only aiming to get around the $5000 mark," Ryannan said.

She said she was quite emotional when she saw how much support the couple was receiving.

"Sarah and Caiden were, even more so," Ryannan said.

She said they were the sort of people who were always there for others in need of support.

"I think that comes back and pays dividends later on in your life when you're in need of support," Ryannan said.

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The couple met through their shared interest in online gaming.

The popular game Call of Duty is believed to have been what brought Sarah and Caiden together, years ago.

Ryannan said the pair had been living in Bendigo for the past couple of years.

But Sydney had been home for much of Sarah's life. That's where Sarah's family travelled from following her diagnosis, to support her.

Ryannan said her brother had a lot of support around him, too.

"He's wanting to spend as much time as he can with her and make sure she's feeling as happy and supported as possible," Ryannan said.

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She said the money people had donated would give Caiden more flexibility to spend time away from work and with Sarah.

Sarah was also putting together a list of things she was really keen on doing, which the donations might help cover.

"They're just overwhelmed with the amount of money people have donated," Ryannan said.

"Anything else from here they want to make as a donation."

For more about the fundraiser, visit gofundme.com/f/sarah-and-caiden

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