How secure are you as a person? Chances are that your family doesn't know everything about SFI that you do.
It's always nice when your family supports something that you do, but it is not required. Leaders, Lead!
If you are secure with your decision to have a business with SFI, that is all that is required. In time, your success will quell any doubts, and they will come around to your side, and support you.
