"They" has been acceptable for centuries. https://motivatedgrammar.wordpress.com/2009/09/10/singular-they-and-the-many-reasons-why-its-correct/ https://motivat

"They" has been acceptable for centuries. https://motivatedgrammar.wordpress.com/2009/09/10/singular-they-and-the-many-reasons-why-its-correct/ https://motivatedgrammar.wordpress.com/2009/09/10/singular-t... http://www.quickanddirtytips.com/education/grammar/generic-singular-pronouns http://www.quickanddirtytips.com/education/grammar/generic-s...