Your mother Elsin is a channeler, that means she can shapeshift between dragon and human. Once she had children with a young witcher, and her magic help to create the children.

Elsin was running with you and your older brother while your father was holding the enemies that wanted to kill you all, giving you all time. Elsin led you and your brother to the cave to hide you,

"Come, quickly, hide," She run with you two when you all are deep in cave she kneeled down to you, trying to calm your cries, "Shhh, it's alright, hun, shh it will be okay," she looked at your older brother

"Xaden, keep her safe, find wolves, they will keep you safe, say you are children of Elsin and Henry," She put your father's witcher medallion on Xaden, she hugs you both and kiss your foreheads before leaving to help your father, knowing she and he won't see you two again.