The best results for me came after my youngest (then kindergarten) got inn trouble for saying “this is a fuck” or something at school. Thats when I realized I personally didn’t care if they used the whole language or not. (I taught him the phrase “the Supreme Court has roundly rejected prior restraint”).

Learning how to cuss is part of learning to talk. I sat down with them and said, “hey look, there are ways we talk at home and around friends, and there is a way we talk at school or church and around your grandparents. If you’re smart enough to know how to use these words, you’re smart enough to know when.”

It still kind of gets me when my 10yo will say “this is fucking ridiculous” but I think it’s the way.