A Boy's Tale Mostly Fiction, It Now Seems
Relatives of Edwin Daniel Sabillon, 13-year-old boy who captivated city with his tale of traveling solo from Honduras to New York in search of his father, say he manufactured much of what he told police and people who helped him; police say Sabillon has admitted that his story--that his mother was killed by Hurricane Mitch, and that his only living relative is father he has never seen--is not true; relatives say Sabillon's mother is alive and living in Honduras, as is grandmother who reared him; say it is boy's father, Grevis Sabillon, who is dead; say boy apparently ran away from his grandmother's home in Honduras and went to live with his aunt in Hialeah, Fla, for about two months; say he disappeared from his aunt's home on June 24; photo (M)