A French court on Wednesday jailed Anne Diana Clain, whose two brothers were notorious propagandists for Islamic State, for nine years for terrorist association.

Paris's criminal courts handed down the sentence to Clain, 44, for having attempted between 2015 and 2016 to head to conflict-ravaged Syria with her husband and four children to join her brothers Fabien and Jean-Michel Clain.

Fabien Clain has been identified as the voice in an audio recording claiming responsibility for the 2015 Paris attacks which killed 130 people and warning that they were just "the beginning of the storm". His brother has also been accused of being an IS propagandist in Syria.

The court also found Clain's husband Mohamed Amri, a 58-year-old Tunisian, guilty and handed him a ten-year sentence as presiding judge Isabelle Prevost-Desprez highlighted the couple's determination to reach Syria.

"That project failed but not because you wanted it to -- you never gave up on (the idea) of your own volition," she said, recalling how Anne Clain's attempt to reach Syria failed when the convert to Islam was arrested at the Turkish border in July 2016.

"You took your children off on a deadly trip as far as your arrest in Turkey on the Syrian border," said Prevost-Despreznte, saying the scheme was "extremely serious."

artist's impression of Clain
Artist's impression shows Clain (right) and her husband (second right) during the trial in Paris Photo: AFP / Benoit PEYRUCQ Benoit Peyrucq/AFP

Amri had claimed the couple had not been planning to stay in Syria but merely to visit family.

The couple's entourage, including their children, burst into tears when sentencing was passed down.

The prosecution had called for ten-year jail terms for both.

Anne Clain left France in August 2015 with Amri, their three children and his son from a previous relationship, all four of them minors.

She said in testimony that she had hoped to experience an Islamic "utopia" but admitted she had been blind to the ideology of her radicalised brothers and that of the Islamic State group.

Clain's lawyers said she had renounced those beliefs over the past three years and added she would appeal.

Copyright AFP. All rights reserved.