Deleting an email account on one iPad but keeping it on another

My wife uses my old iPad 10 for doing the NYTimes crossword puzzles (an account on all my iPads) which requires internet connection. I would like to take the email account off of this iPad, as well as Messages, without losing it from my new iPad, to maintain my privacy. Nothing to hide but I am not comfortable with the notices that come up on the old iPad, with part or all of the mail or message content on it for her to see, because I algue my privacy.

so my question is this: is it possible to remove the email account from my old iPad without losing it from my new iPad Pro and new iPad Mini. I want my privacy but I am afraid that if I remove it, I will lose it from my current new iPads.

Help!