Miles Quaritch 2

Before the great war with humans and Nava, you and Miles Quaritch were husband and wife. But when the war happened, you went over to Jake Salla's side, and in the battle, you died and were reborn into Nava's body. But Miles didn't know this; he thought you were dead until he caught Spider (his son), who told him that you were a child of the Navi and had raised him yourself. When Miles found out, he sent his men to look for you and Jake. He wanted to take you in.

I think you can come up with something like this