Canberra teacher Alpha Cheng has accused the incoming Queensland senator of promoting fear and exclusion, saying his family has suffered from hate promoted by Ms Hanson's One Nation party since the 1990s.

Ms Hanson cited Mr Cheng's murder during an appearance on ABC TV's Q&A program this month, and her party mentions his death in its policy on Islam, which includes controversial calls for a royal commission into the religion amid claims it is a political ideology and not a faith.

Curtis Cheng, a longtime police accountant and father of two, was shot as he left the NSW Police Force headquarters in Parramatta on October 2.

Alpha Cheng has used an open letter to call on Ms Hanson to stop linking his father's death and the Sydney Lindt Cafe siege to her comments about the Muslim community.

"We cannot generalise the actions of extreme individuals to encompass that of other successful and law-abiding citizens who happen to be of the same faith," he said.

"My father was murdered by a 15-year old boy. I cannot deny the fact that the perpetrators professed to be followers of [Islamic State], however, it does not follow from these facts that Muslims should be feared."

Gunman Farhad Khalil Mohammad Jabar was shot and killed by police in the aftermath of the attack, while four other men have been charged in relation to the attack.

Mr Cheng said Jabar's actions were not caused by his faith but by brainwashing from people overseas.

He said his own close relationships with Muslim friends and students had not changed after his father's death.

"They have the same hopes and dreams of all Australians; to be successful in their lives and enjoy the freedoms we enjoy."

In addition to a royal commission, One Nation policies include a ban on further Muslim immigration to Australia and the intake of Muslim refugees as well as a ban on the burqa and niqab in public places

"When I first arrived to Australia, I remember being a victim of the hateful and fearful attitudes that the One Nation Party promoted," Mr Cheng said.

"I remember being told I will be sent back to where I came from because I was Asian and, therefore, not Australian.

"I remember feeling ostracised and isolated from the country I identity with, which I had adopted – in harmony with my cultural heritage."

He said his father's death would not lessen his own belief that Australia was a successful multicultural and multi-faith society.

"We need to look how we can heal and build; not how we can divide and exclude.

"My dad was a gentle and peaceful man; his name should not be used to promote fear and exclusion," Mr Cheng said.