BECOME MORE OF A PARENT THAN A FRIEND
Hot sauce. Every time they say those bad words, you make them drink hot sauce til they cry. Then you make them write 100 times they will not use bad words. they will either get the message or they will no longer have tastebuds. Don't wash their mouths out with soap though it could kill them and you don't want to do that, you just want to stop their potty mouths.
my daughter is 9 1/2 and she's got a whooper of a mouth on her.
between laughs and jaw dropping
No matter how much she complains and rant, make sure she knows you care about her and only her. That's the most important thing. She'll, hopefully, come back as a human being in a few years. Remember, it's her job to stretch and test her limits....... I will tell you, as a rule, boys are on the delayed plan about the time they get a drivers license..... Kids are a trip.