they had the same mother because they're brother and sister
they have the same mother because they brother and sister
pro:sub v det:art adj n conj pro:sub n coord n
they had the same mother because they're brother and sister .
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t h e y WORD_BOUNDARY h a d WORD_BOUNDARY t h e WORD_BOUNDARY s a m e WORD_BOUNDARY m o t h e r WORD_BOUNDARY b e c a u s e WORD_BOUNDARY t h e y ' r e WORD_BOUNDARY b r o t h e r WORD_BOUNDARY a n d WORD_BOUNDARY s i s t e r WORD_BOUNDARY