Rise of the Runelords
Tsuto is the half brother of Ameiko Kaijitsu. Although he is the eldest son of Lonjiku Kaijitsu it is only because his father refused to create a scandal by acknowledging the truth publicly…. Tsuto is half-elven – and so his father is obviously someone else.
Tsuto left Sandpoint several years ago after a falling out with his father – he hasn’t been seen since that time.