Kids/Parents/Swearing

I don't think the idea is for the kid not to swear just because the parent/parents have baggage with it. The important thing is that one understands the power of words and even more so the intent behind words.
As for a parent that doesn't like it I suggest you let that go as its just a word and there is no sense in agreeing or filtering ones self based on stigma. Otherwise just ask that the kid doesn't swear around you or too you...even still I suggest letting it go because one of the most sacred things about family is honesty and unfiltered communication. Everything you require etiquette, filters, policy, and stuff of that nature is just another layer on the onion of pretending.
If a child wants to stop swearing then ask for punishment or something every time one swears so there is reason to stop. Easier to just stop though.

Swearing can be like drinking, smoking, or sex. The more resistance to it the more it shows up. The beautiful thing about a child compared to an adult is a child still wants and is connected with being ones self. As pressure is applied to follow someones else's idea of life, rebellion and fight come out. As an adult all that fight and passion is gone, adults just fit in and play nice because its all they know and all they have left.
I would not want this for my child.
The reality is that a free connected child will not choose something that doesn't serve one for long. Its important to be able to choose it though if it does and to be able to choose not to when its right. Process and experience are priceless and cannot be taught or forced.