They have to realize it themselves before they can accept any "help".
I just told my friends what im doing, theyre fine with it, but the AFC ones wouldnt join in, they were just hesitant to think that "changing how i present myself" could be valuable and learned. So i gave one of them a quick read through Jugglers book, now hes convinced. So he goes out sarging with me and discusses the topic. Another friend of mine just refuses to believe that change is valuabe for him, he sticks to introductions through friends and school/work to find women, and then he spends months getting to know the girl while hes making up this ideal relationship and the girls personality before he even knows her... And then he ends up banging some rather ugly girl that he doesnt even like. This is my hard case to crack. I guess hes just grown comfortable as he is...
But first focus is me and my recovering buddy

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Good luck with your cousins, man, i hope for their sake that you can bring them to better lives.