Today is National Sorry Day, but many Indigenous Australians say they're still being asked: 'Why should I apologise?'

The tin humpy where Monica Wallabindi's mother lived with her nine siblings. (Supplied: Monica Wallabindi)

When Monica Wallabindi's mother was just two years old, she was stolen from her family's shanty on the outskirts of Geraldton, Western Australia.

She was one of 10 children, and her family was living in a tin humpy with a dirt floor and no running water.