Daremoga [[zibunno sinsekiga mita] hito]o sagasiteiru ga, bokuwa [[dono zibunno sinsekiga] (da)] ka siranai.
everyone-NOM self-GEN relative-NOM saw person-ACC looking.for but I-TOP which self-GEN relative-NOM COP Q know-NEG
Everyonei is looking for a person who hisi relative saw, but I don't know which relative of hisi.