With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tennis in the 19th century referred to a racquet sport.
text_B: Family of the Year is an American indie rock band based in Los Angeles , California consisting of members Joseph Keefe -LRB- vocals / guitar -RRB- , Sebastian Keefe -LRB- drums / vocals -RRB- , James Buckey -LRB- guitar / vocals -RRB- , and Christina Schroeter -LRB- keyboard / vocals -RRB- .. Los Angeles. Los Angeles. California. California. indie rock. indie rock. Their music uses melodic male / female vocal harmonies and folk tale-style lyrics .. They are perhaps best known for their international chart hit , `` Hero '' , which became a top 10 hit in Austria , Belgium , Germany , and Switzerland .. Hero. Hero ( Family of the Year song )
not_related.