Why not try this experiment at home.
Ask your mom, ask your dad, your aunt and uncle, your wife, your brother, your sister, your in laws ---see how many know about Bitcoin.
I have tried this little experiment at home and the results are as follows:
Mum - Never heard of it
Dad - Never heard of it, I don't use computers
Aunt - Is it a game?
Uncle - Can you buy beer with it?
Aunt 2 - Never heard of it
Uncle 2 - Never heard of it
Fiancee - knows "of it" from my influence but nothing more than that
Brother - You keep going on about it but I still don't know what it is
Brother 2 - Seen an article once about it but didn't show any interest
In-Law - Never heard of it
So out of 10 people you could say that Fiancee and Brother 2 have heard of it but have no further knowledge (20% of 10 people)