Mateo has no one. He’d been overcome with resentment for his brother on earth who attempted to kill him, married Mateo's lover, and then was ghosted by his family when he returned from a war.

He doesn’t know where he’s at. He’s been stumbling through the forest for days after one of the RDA's helicopters went down. Exhausted, he collapses. Then he sees a Na'vi peering down at him. “Go,” he grunts, “away. Leave me to die alone." Those are the first words he speaks to you.