To trace s.o.'s origin, ancestry, or geneology; to relate one's ancestory or geneology to s.o. else.
If Elik is traced back to his father, he is a Filipino descendant.
If the origin of black Americans is traced back, they came from Africa.
I'm embarrassed to relate my ancestory to him even though he's one of my relatives because he's rich now.
He's glad that I trace my ancestory back to him because he knows now that we have the same grandfather.