An online fundraiser for the young Upper West Side family killed in a horrific murder-suicide has generated nearly $106,000.

Friends and family of Aleksandra “Ola” Witek, 40, and her kids, 1-year-old Calvin Lopez and Lucian Lopez, 3, launched the fundraiser to help defray funeral and legal costs, they said.

“Ola was an incredibly loving and devoted stay-at-home mom to her two young sons. Being a NYC school teacher, she instilled her knowledge and teachings on the growth of her boys who had blossoming imaginations and whose curiosity and sweetness to family and friends alike captured everyone’s hearts,” reads a portion of the GoFundMe, which does not mention Edison Lopez.

“As the family and close friends of the remaining Witek family members: Lukas, fiancé Emma Hutchison, and mother Grazyna (as well as Ola’s late father, Teddy Witek), we are heartbroken and incensed,” organizers wrote on the fundraising site.

Witek’s fiance, building super Edison Lopez, 41, knifed his fiancée and the kids to death before taking his own life this week, police said.

“Ola was a fantastic and kind teacher for our children. We are so saddened by the loss. We will always remember what a great impact she had on our family,” posted donors David and Rebecca Leckstein.

The family was planning to move out of the city into a bigger home just days for the grisly slayings.