An 11-year-old girl is the sole survivor of a Seattle house fire that killed her mother, two siblings and their father, who police say barricaded the family inside and set the blaze.

Lulu Ragusa escaped by jumping out a window and running for help, her aunt wrote on GoFundMe.

The girl has "always put her family first" and "took on a protective but nurturing role" with her siblings, wrote Adrea Sloniker. "Therefore I’m not all surprised she jumped out a window with a 16 foot drop to help others survive. She thought she was going back to save her brother & sister after calling for help."

But her siblings, 4-month-old Valentina Ragusa and Sebastiano "Seby" Ragusa, 7, died alongside their mother, Lana Stewart, 40, and Rosie, the family's dog, inside their home in the Wallingford neighborhood.

4-YEAR-OLD TWINS SUFFOCATE IN TOY CHEST: ‘THEIR SOULS WERE TOO PERFECT,’ MOM SAYS

Stewart died of "multiple sharp force injuries" while her children died of smoke inhalation, the King County Medical Examiner's Office told Fox News Digital. The three deaths were ruled homicide. 

The children's father, Salvatore Ragusa, also died of smoke inhalation, but his death was ruled a suicide. 

The GoFundMe campaign had raised $41,981 as of Friday afternoon, and the money will go toward paying for Lulu's recovery and education. She will be adopted by a family member. 

Sloniker said her sister and the children endured years of abuse at the hands of their mentally ill dad. 

"Over the years of knowing Sal, he went from a loving father to someone no one would have ever imagined," she wrote in a statement on Facebook. "What began as a slow mental spiral, suddenly went out of control before Sal would consent to receiving professional help again"

MASKED SUSPECTS IN SEATTLE TASE, ROB MAN AT GUNPOINT OUTSIDE HOME, VIDEO SHOWS

Salvatore, who she wrote suffered from schizophrenia, lived in paranoia, believing he was being spied on and that the family's phones were wiretapped. 

"At times Lana & the kids endured lies, manipulation, uncertainty and forced isolation," the statement says, adding that Lana often succeeded at calming Salvatore's delusions but at a heavy emotional cost. Lana knew she had to leave Salvatore but hadn't yet "gathered the strength," her sister wrote.

Salvatore was charged in 2019 with setting fire to Lana's apartment and threatening to kill himself, FOX13 reported.

In one recent family photo, Lana is shown holding her infant in her arms as her older children play in the yard with Rosie.

"One of her favorite things in life was being a mother," Sloniker said of her slain sister. 

Lulu had a special bond with Sebastiano, who "loved to laugh and be goofy."

SEATTLE STARTS HIRING UNARMED ‘ALTERNATE RESPONSE TEAMS’ TO RESPOND TO 911 CALLS

"His rambunctious little spirit will be missed especially by Lulu as she was the happiest when by his side," she wrote. "Baby Valentina was a bright light from the very beginning."

Lulu loved to make her little sister burst into giggles and helped teach her how to crawl, she wrote.

Despite the the family's loss, Lulu will thrive, her aunt wrote.

"We want everybody to know that even though this was an extremely tragic situation, Lulu will be able to live her life to her fullest potential," she wrote.