You have my "virtual/cyber" hand, if you need it!
You sound like you've put much thought in to your "life style" and realize it is not the best thing for you.
Remember, there is no sin that God cannot forgive. He just waits for us to realize we are sinning, to repent and to ask for His forgiveness.
Why don't you just ignore those silly family members and do the "right" thing. Maybe if you show courage and perseverance towards your faith, you will bolster your father's courage, so he too, can benefit.
You are in my unworthy prayers.
Lord, have mercy!