The parents of a Perth-born man jailed in Saudi Arabia on accusations of terrorist-related offences have met with Australian government officials in a bid to assist their son.

Shayden Thorne, 25, has been held in a prison outside the Saudi capital Riyadh for more than a year, since terrorist material was found on a laptop that he claims he borrowed from a mosque.

His family fear he will be sentenced at his next court appearance on May 29.

Despite claiming innocence, it's understood Shayden confessed under duress.

Meanwhile, his 23-year-old brother Junaid Thorne remains in hiding in Saudi Arabia because he is too frightened to face local officials who want to question him.

Junaid was incarcerated for two months for protesting against his brother's imprisonment.

On Friday. with only a week left until Shayden's court appearance, supporters of the men, both Aboriginal Muslims, marched through Perth before their parents met with Department of Foreign Affairs and Trade (DFAT) officials.

The group posted a message from the Nyoongar Tent Embassy on its Facebook page on Thursday, calling for people to take part in the picket.

"The Australian government aren't assisting. The Aboriginal organisations aren't assisting," they said.

"No one is helping this grief-stricken father except our crew.

"This family are crying out for support and all they want to do is raise enough funds to attend their son's court trial in Saudi Arabia for next week."

A spokeswoman for DFAT said the state office director met with the parents and spoke with them "at some length" about progress with the consular process.

She said the parents were also told what the department's team was doing in Canberra and Riyad.

The family also requested further assistance from the department, the spokeswoman said.