Daremo-ga [[zibun-no sinseki-ga mita] hito]-o sagasiteiru ga, boku-wa [[dono zibun-no sinseki-ga] (da)] ka sira-nai.
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.