Since your dad is aware of the current technology, then probably he did his research about Bitcoin (after you introduced it to him) and after seeing the potential, he decided to engage himself. So congrats for convincing your dad, for letting him be aware of this digital gold.

In my case, I entertain people who are showing interest but not to the point that I will convince them to invest. Because as others have said already, I also don't want to be the one to blame incase something went wrong with their investment. Hence, I prefer to let them decide not because I convince them to do so.