I know–from personal experience–how difficult it is for English majors like me to adjust to the use of the singular “they.” The most common objection raised by my friends is that “It’s not grammatical.” Well, now it is!

https://www.washingtonpost.com/lifestyle/style/a-grammar-nerd-gently-dismantles-your-arguments-for-rejecting-the-new-they/2019/09/20/95f87260-da56-11e9-a688-303693fb4b0b_story.html?fbclid=IwAR20IXHMqSDjK2LCWNmuOqe9Oit2HjpjsfLhOMx-eu3168pMTWZQ94_Wdxo