I accepted the challenge from the internet to find Jack's sister in the prologue village scene. And sure enough, there Emma (that's her name out of the novel) was talking to a man inayofuata to a moto pit. BUT then I found two older Emma look-alikes!
picha
rise of the guardians
jack frost
prologue
jack's sister
emma
pippa
This Rise of the Guardians picha might contain
tamasha.