Heartbroken parents are calling for change after their little boy and both her parents were mowed down by a 91-year-old driver.

Vicky’s mum and dad were taking her two-year-old son for their regular walk in Wantirna South, in Melbourne‘s east, on July 10 when they were wiped out on the footpath by a Toyota Yaris that had mounted a kerb.

WATCH THE VIDEO ABOVE: Mother calls for change after son and both parents mowed down by elderly driver.

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Her mum, 59, died at the scene, and her 60-year-old father succumbed to his injuries days later in hospital.

“I totally lost the ones who loved me the most in the world,” Vicky told 7NEWS.

Miraculously, her son survived with only scratches and bruises.

“(His) grandparents (protected) him. The second they saw the car, they didn’t see themselves at all,” the boy’s father Ethan told 7NEWS.

The grandparents only recently moved to Australia to care for their only grandchild.

“I was just thinking, why (are) you always pushing me to have a child, I don’t want it, but now I deeply and truly understand,” Vicky said.

“My son Carl, because of him, I need to keep going.”

The grieving parents want change, saying it is time elderly Victorians face compulsory driving tests.

“Victorian legislation is way behind,” Ethan said.

“You can’t guarantee (that) everyone can still drive when they are 70, 80, 90-years old.”

Police interviewed the 91-year-old driver on Friday, releasing her without charge.

“I suppose she’s someone’s mother, but where is my mother, where is my father?,” Vicky said.