Luke and Katie Rollinson are superheroes - as far as their kids are concerned.

Luke Rollinson was only 15 months old when he lost his right eye to eye cancer. Luke and Katie's two children, Eli and Harper, were also born with retinoblastoma, and both have undergone treatment on tumours behind the eye.

In fact, baby Harper was only two weeks old when she received her first round of chemotherapy, making her one of the youngest patients to undergo the intense cancer treatment at the Children's Hospital at Westmead.

Harper, now seven months, has just completed six rounds of chemotherapy, successfully shrinking the tumour. Her doctors will continue to monitor her closely over the coming months to decide the next steps in her treatment.

The Bulli husband and wife didn't hesitate to jump on board when asked to be ambassadors for this year's Wollongong Relay for Life run by Cancer Council NSW.

"It's definitely a cause that's close to our heart, and it's an opportunity for us to give back to organisations like this," Luke said. "It's organisations like Relay for Life that help you out with all the little things, along the way, that often people don't see."

The Rollinson family will stand alongside this year's other ambassadors, including the Sisters Cancer Support Group founder Nyan Thit Tieu. Mrs Tieu began the support group for Muslim and non-Muslim women of culturally diverse backgrounds who are, or have been affected by cancer, after her own struggle with breast cancer in 2013.

The theme of this year's event is "Super Heroes", with the relay committee inspired by the super-human strength and unshakeable courage they have witnessed in years of working with cancer survivors and carers.

"We're just really humbled to be asked to be ambassadors, to be honest," said Katie.

This year's event will be held on September 19-20.

Information, registrations: http://fundraising.cancer.org.au/illawarra2015