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No gender specified in ask so they/them/their pronouns used.
Considering the age reference you've given, this child would've been born on Pandora and therefore too small to go back to Earth, like Spider.
[ ] They're insanely protective of Kiri. They likes the other Sully kids but Kiri is literally their baby sister. They biologically have the same mum, just in different forms, so there's a closer bond.
[ ] They'd really gets along with Spider because he's the only other human child on Pandora. They'd understand each other's struggles growing up amongst Na'vi.
[ ] Norm and Jake (maybe Max and Neytiri too) are always watching this child like they watch Kiri simply because they're Grace's child. They worked closely with Grace and really liked/respected her so it's very likely that they'd watch her child(ren).
[ ] They'd watch Grace's old video logs to feel closer to her because they don't have many memories of her, if at all.
[ ] They'd also talk to her dormant avatar in the lab for the same reason.
[ ] While Spider is the more outdoorsy human child, they'd be the embedded-in-lab-stuff human child. Why? Grace would've likely mentioned a few things in her video logs that piqued their interest.
[ ] They'd be a Spiri shipper because they'd see Spider and Kiri yearn for each other for a while (TWOW shows yearning).
[ ] Coming from the last point, they'd be a wingperson for both since Kiri is their sister and Spider is their best/close friend.