Brett Fenwick, 36, of Lower Barresdale, Alnwick, entered Louise Pearce's home on December 27 last year following an ongoing altercation, stabbing, kicking and punching her before leaving her motionless in a neighbour's garden.
Officers found Louise’s partner Gareth Mallaburn with a stab wound to his neck and moments later found Louise with life-threatening injuries to her neck, face and arms.
Brett Fenwick pleaded guilty to attempted murder in June this year, however, he and his brother Blaine, 24, both of Lower Barresdale, had denied assaulting Gareth.
Two knifes recovered from the scene were confirmed as being the weapons used to carry out the attacks.
Now a jury at Newcastle Crown Court has found both guilty of wounding with intent to commit grievous bodily harm for the assault on Gareth.
In her statement read in court Louise, 33, said: “I suffered life changing injuries that night, I have had plastic surgery operations and have been told I will need further surgery in the future. I struggle to sleep and regularly shout out and have nightmares.
“My children are my priority; I am trying my best to help them through this awful time whilst dealing with my own pain.”
Detective Constable Christopher Rogan of the Force's Safeguarding team who believes both Louise and Gareth are lucky to be alive: "This has clearly been a hugely traumatic experience for both victims and I can't stress enough how dignified they have been through this court process,” he said.
“At some point in their lives, these people have been friends and it's hard to accept that someone you know could carry out such a violent attack on you.
"They both suffered horrendous injuries and are lucky to be alive. Thankfully we don't see violent attacks like this every day but it needs to be made clear that any intent to commit such grievous harm is wholly unacceptable and can utterly destroy lives.
The pair are due to be sentenced at Newcastle Crown Court on January 7.