Jessica's mum, Kelly Breeze, said she was so scared on the night of the killing she wet herself
Murder accused Jessica Breeze wept in the dock as her frantic 999 call to police was played to a jury.
In the clip, Breeze emotionally told an operator "I don't wanna go to jail" and "I swear down it was self defence", as a tearful public gallery watched on.
Harrowing evidence heard by jurors on Thursday included an account from Jessica's mum, Kelly Breeze, who was also in the house on the night of the killing.
The court heard she was so scared on that night that she wet herself.
Jessica Breeze's barrister, Simon Russell-Flint QC, read out much of the account she gave to police of what unfolded.
She had described a furious row breaking out over over the fact Mr Brady had discovered Jessica, then 19, had a boyfriend.
He was said to have a "mad face" as he set about assaulting his daughter.
Mr Russell Flint said: "When he got there he just started to hit her, punching her, slapping her to her face and to her head."
Kelly claimed to have tried to force her way between them, before Mr Brady aimed a kick at her while telling them to "f***ing shut up" and "get out of my f***ing sight", before taking the keys out of the door.
Jurors heard how Mr Brady then got a knife from the kitchen and began slashing at his arm or wrist saying: "Is that what you want me to f***ing do?"
The two women fled upstairs, Kelly said, before her partner followed.
The mother said her daughter had tried to escape from an upstairs window before Mr Brady entered the bedroom.
She described hearing Jessica saying "oh dad, no, dad don't", although she couldn't see what was unfolding.
The women ultimately went downstairs when jurors heard Mr Brady had grabbed his daughter's phone and demanded she unlock it, before saying he was going to smash their cars up.
Kelly Breeze said Mr Brady had screamed "I'm gonna f***ing kill yers" before her daughter came past her and stabbed her father.
A grim picture of years of abuse from Mr Brady towards his partner was also painted to jurors.
The court heard how Kelly Breeze met him aged 16, when Mr Brady was 28, and got pregnant with Jessica at that age.
She claimed the first meal she'd ever cooked for him was a spaghetti bolognese "which he picked up and threw against the wall".
In 2010 she said he "grabbed me by my hair and pulled me down the stairs".
When she fled in a car, she described being followed by Mr Brady.
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Jurors were told: "Colin got out, was leaning on the bonnet and said 'get her out of that f***ing car or I will tip it over with the kids in'".
On another occasion she was choked unconscious, the court heard.
And Kelly Breeze said her daughter, Jessica, was also subjected to abuse.
Mr Brady had threatened to throw her out of the house on learning she was pregnant in 2014 and was said to impose a curfew on her and ask questions about what she'd been doing when she came home.
Jessica Breeze, of Central mews, central Middlesbrough, denies murder.