I have another take on this
I told my parents all about TF, WAPF, NT 6 years ago and gave my mom a copy of Nourishing Traditions, but nothing came of it. They were doing organic and as unprocessed as they believed was healthy, but no raw milk, lite on animal fats, no fermented, lots of boxed cereals, crackers, etc.
So about 2 years later (the whole time we are doing TF, minus the milk being raw), my Mom, through Mercola I think, gets into WAPF, starts eating animal fats and espousing the virtues of raw dairy and grass-fed, etc. I smirk at how she thinks she "discovered" this on her own.
Then about a year later, I was in her pantry and said, "Hey mom, you have 2 copies of Nourishing Traditions". She says "Yeah, I bought one last year (i.e. when she "discovered" TF) and then I found the other one when we moved, no idea where that came from"

:
Moral of the story: the youngest daughter can't possibly know what she is talking about, ignore her, then when you "discover" what she's been telling you all along, still don't believe she could have found it herself.
Hmmm...
Oh well, its all worth it to be able to go over for dinner and have locally raised grass-fed roasts and raw butter.