A woman whose three immediate family members were murdered in the Christchurch terror attack wants the killer to embrace the beauty of the Islam faith and become Muslim.

Ghulam Hussain, Karam Bibi, and their son Zeshan Raza, were all killed at a small mosque in Linwood during a attack that would claim a total of 50 lives.

Hussain and Bibi leave behind a daughter, and Raza's sister, Maryam Gul.

The couple had been visiting their son for the first time in New Zealand since he moved from Pakistan four years ago, the BBC reports.

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Maryam Gul, told the BBC the trio were her entire family.

"How's it possible not even one of them survived?"

Zeshan Raza, mechanical engineer from Pakistan. Photo / Supplied
Zeshan Raza, mechanical engineer from Pakistan. Photo / Supplied

Her parents were supposed to return to her in Pakistan next month, she told the BBC.

"Nobody knew that they will never come back," she said.

"For this world, I feel that all of my family has gone.

"But I know that when you have nobody, you have Allah with you."

She said at first she wanted to see the person responsible punished "severely".

"But then I realised that's not the sunnah [example] of my prophet."

Her prophet had shown an example of forgiveness, she said.

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"I want him [the gunman] to become Muslim and repent, and see that it's wrong, and realise how beautiful Islam is."

Ghulam Hussain, from Karachi, Pakistan. Photo / Supplied
Ghulam Hussain, from Karachi, Pakistan. Photo / Supplied

Nine Pakistanis were killed in the Christchurch attack.

Hussain grew up in Karachi and worked for Pakistan Airlines until his retirement.

Bibi was also born in Karachi, but her parents were from Punjab in India, the BBC reports.

Karam Bibi, from Karachi, Pakistan. Photo / File
Karam Bibi, from Karachi, Pakistan. Photo / File