Curse at them. My first memory is of my mom screaming at me, "You damn (my name)!"
Absolutely refused to swear in the presence of my step kid until their mother told me they do swear, and kiddo is allowed to swear once per day now that they understand the power of language.
Kiddo is at that stage where they will ask permission to use their "one swear". As a bonus, I will give them feedback on how appropriate/inappropriate the swear was.
Haha, that's hilarious. You and your kid should get one of those Word A Day calenders and try and use a new word everyday. Me and my sister used to do this and it was fun.