I explained to my family that BTC is a currency, and my father said, "just like the dollar?"

No need to explain to my family because Bitcoin is introduced fist to my family. They just saw why my life change and they are interested how to join in bitcoin. Because once bitcoin is expose to one place this will be easily adopt because you can see the evidence that there's something new happend in your life. Even in friends they if just they just see the proof that your life change they will beleive on you.