Lawyers for two brothers who randomly kidnapped and sexually assaulted a teenaged girl two years ago say their clients should undergo tests to determine how responsible they were for their actions.

The sentencing hearing for Corey Manyshots, 25, and his brother Cody, 21, was scheduled to continue Friday but has been postponed until Dec. 8.

Defence counsel are trying to find funding for specialized testing to determine if the siblings have fetal alcohol spectrum disorder. Lawyer Alain Hepner says he is hoping legal aid will pay $11,000 for the tests and, if not, he will apply to the court for special funding.

The Crown says it doesn't object to the testing since mental competency is important in determining a jail sentence.

The brothers pleaded guilty in October to kidnapping, uttering threats, sexual assault and robbery after the girl was grabbed at a bus stop and taken back to their home before she eventually escaped.

According to an agreed statement of facts read aloud in court after the pair pleaded guilty, the brothers approached the victim and forced her into an alley, where they smashed her head on a garage and the ground, before taking turns sexually assaulting her.

The Taradale bus stop where police say the 17-year-old victim was taken from. (CBC)

They also smashed her phone and emptied some of the contents of her purse.

The brothers threatened to kill her if she didn't do as they ordered and marched her to their home in the neighbouring community of Martindale.

Their father and a friend were in the home, as well as Corey's baby and the child's mother.

The sexual assaults continued overnight in different rooms of the home.

Around 8 a.m the next morning, the girl was able to escape while others in the home were sleeping.

She took a bus and LRT home where she broke down at the front door, telling her mother what had happened.

The victim and her mother went to the police station and gave a statement. She was then able to guide officers to the two locations where the assaults took place.

Investigators found some of her personal items, like her sock and wallet, in both the alley and the Manyshots' home.

During her medical exam later in the day, the girl was found to have black eyes, bruising and cuts on parts of her body and tearing consistent with sexual assault.

Community impact statement read

Members of the Taradale Community Association read a community impact statement outside court in support of the victim.

"From the beginning we've been trying to do anything we can to try to make a difference or make an impact to show the community cares," said Rachelle Christopher.

"We've never spoken to her, we've never met her but we hope that she has heard today that people care, Taradale cares, Calgary cares."