Spider in Avatar: The Way of Water does not have a fully explored family tree on screen. That is why the question of who Spider’s mom is in Avatar 2 keeps coming up.
The direct answer is that his mother is Paz Socorro, a detail confirmed in Avatar lore outside the movie itself.

Paz’s identity connects Spider to Quaritch, the RDA, and the wider Avatar comic canon. The movie only hints at this connection.
That missing background helps explain why Spider feels torn between the Sully family, his human roots, and the truth about his birth.
The Direct Answer From Avatar Canon

Paz Socorro is Spider’s mother. The Avatar comic material tied to James Cameron’s expanded story world reveals this.
The movie Avatar: The Way of Water does not spell it out, so you need the canon outside the film to get the full answer.
Paz Socorro Is Spider’s Mother
Paz Socorro gave birth to Spider, whose birth name is Miles Socorro. She had a relationship with Miles Quaritch, and that led to Spider’s birth, as noted in ScreenRant’s coverage of the comic reveal.
Where The Reveal Comes From
Avatar: The High Ground, the comic series published by Dark Horse from an earlier sequel script, gives the clearest reveal. That material provides the backstory that Avatar: The Way of Water leaves in the background.
Why The Movie Doesn’t Spell It Out
Avatar 2 focuses more on Spider’s place in the Sully family and his bond with Quaritch. Jack Champion’s character carries mystery, so the film keeps Paz Socorro mostly offscreen.
How Spider Is Connected To Quaritch
Spider’s story centers on his connection to Quaritch. That link shapes his place on Pandora and explains why his loyalties are so hard to define.

Miles Quaritch As Spider’s Father
Miles Quaritch is Spider’s biological father. This gives Spider a direct tie to the RDA and the human side of the conflict.
That fact matters as much as any Na’vi connection because it places Spider between two worlds.
Why Spider Grew Up With The Sully Family
Spider stayed behind on Pandora and was raised by humans who remained there. He later spent time with the Sully family.
That upbringing gave him a close bond with the Na’vi and with Pandora, even though he is human.
How Jake Sully And Neytiri Fit Into His Story
Jake Sully treats Spider like part of the household. Neytiri sees him through the pain of the human war against her people.
Their family life on Pandora gives Spider belonging, but it also leaves him exposed to conflict when loyalties are tested by the RDA and Quaritch.
What Happened To Paz Socorro
Paz Socorro does not play a big on-screen role in Avatar: The Way of Water. Her death explains why Spider grows up without his mother.

Her Role As An RDA Scorpion Pilot
Paz served as a Scorpion pilot for the RDA and flew with Quaritch’s team during the assault on Pandora. That role placed her on the human military side of the fight.
How She Died In The Battle On Pandora
According to the comic backstory, the Na’vi killed Paz during the attack on the Tree of Souls. That death happened shortly after Spider’s birth.
What Her Death Means For Spider
Paz’s death leaves Spider with a missing parent and a painful family truth. It also helps explain why he clings so strongly to the people who raised him, while still being pulled toward the father he barely understands.
The Link Between Spider And Kiri
Spider and Kiri both live with questions about belonging, family, and what home really means. Their bond matters because each of them is trying to find a place inside the larger world of Avatar: The Way of Water.
What It Could Mean For Avatar 3
Spider’s family history could matter even more in Avatar 3. Quaritch remains a significant presence, and Stephen Lang will return to the franchise.
Recent reporting suggests that Paz could still appear through flashbacks or other story tricks. The sequels might use these methods to deepen Spider’s arc.