A mom, her daughter and disabled step-daughter were found stabbed to death in their Queens home Friday — and a male relative is being sought in connection with the gruesome slaying, according to cops, kin and law enforcement sources.

The victims, ages 26, 47 and 68, were discovered in the Springfield Gardens residence on 182nd Street near 146th Drive by the eldest woman’s’ son and a home health aide around 10:40 a.m., said police, relatives and sources.

The youngest victim, who is bedridden and has special needs, had recently moved into the home from Jamaica a few months ago, neighbors said.

“I’m devastated, it’s a lot. We been here since after [9 a.m.]. We’re just trying to support each other,” the eldest victim’s niece told The Post, declining to share her name.

“I’m still in disbelief. I’m in complete shock.” 

Around 8 a.m., the eldest woman’s son came home from work but didn’t have a key and couldn’t get into the house when no one answered the door, he told neighbor William Sanders, 68, who has known the family for 13 years.

The son waited in his car, knowing a home health aide who cares for the 26-year-old would be arriving soon and would have a key, Sanders said.

When the son finally got inside, he discovered the women’s bodies and called Sanders.

“[He] called me and said ‘Will, run and come. I found Mama [and the other two victims] dead,” Sanders recalled. “I ran every light and came here.” 

Sanders said he and the eldest victim had a close relationship.

“There is no nicer than that,” he said of the woman. “If I was broke, she would give me $20.

“I can’t believe it,” he said of her death. “I won’t believe until they walk out with the body. She was a person that would take time out when I was in the hospital and look at me and burst into tears.” 

A police spokesman at the scene called the incident “isolated” and “domestic” in nature. He added that while no suspect has been taken into custody in connection with the homicides, there was no immediate risk to the public.

A cousin of the eldest victim, who wouldn’t give her name, said she’s heartbroken over the tragedy.

“I’m trying to figure out whether I’m in a dream or something. It’s unbelievable. I know it’s real — I don’t see the bodies, but I know it’s real,” the woman said.

“I don’t know what to say. She was a good person. Nice, loving, caring.” 

Another woman who also spoke anonymously said the eldest victim worked for her family providing home health care to her ailing father. The woman came to the scene after her employee didn’t show up for work Friday morning.

The woman burst into tears when she learned what had happened.

“Are you serious?” she asked.

“I been calling her all morning, and she couldn’t answer me. She comes in to work for 10:30 [a.m.], and when I didn’t see her show up, I started to call her. She’s always on time,” the woman said.   

“We were so close — oh my gosh. I thought she just went to bed and did not wake up.

“My son is in school, when he hears this he going to go crazy.”

Cops are searching for a relative of one of the victims who is believed to have fled the location around 5 a.m. and is considered a suspect, sources said.  

Mayor Eric Adams briefly visited the scene Friday afternoon before he was whisked away by his security team.

He shook hands with police officers in front of the home and was briefed on the incident before telling reporters, “My hearts go out to the family.”

The victims’ family sobbed and consoled one another outside the home after the bodies removed the house Friday night to be taken to the medical examiner’s office.

Additional reporting by Tina Moore, Joe Marino, Steven Vago and Amanda Woods