there is no convincing a guy like that. I find people like that have to prove it to themselves. Let him try to break the bitcoin code, lol ...good luck with that!

My suggestion is keep feeding him mainstream articles about bitcoin good or bad, he will come to his own conclusions.

Besides, did you marry him or his daughter! remember that! When you have these discussions, your wife needs to have your back in the discussion, make sure he understands that all choices are made by the two of you and not just you. 2 against 1 is better odds.