With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: George W. Bush's paternal grandfather is unknown.
text_B: Phoebe Snow -LRB- born Phoebe Ann Laub ; July 17 , 1950 -- April 26 , 2011 -RRB- was an American singer , songwriter , and guitarist , best known for her 1975 song `` Poetry Man '' .. songwriter. songwriter. Poetry Man. Poetry Man. She was described by The New York Times as a `` contralto grounded in a bluesy growl and capable of sweeping over four octaves . ''. The New York Times. The New York Times. contralto. contralto
not_related.