Personally I'd confide in your sisters, aunt and grandparents before telling your Dad.
Then if you tell your Dad or not is up to you, are you able to live in the same house as someone you need to hide it from? Or do you need to tell him to be happy with yourself? There's no right answer there, it varies on the individual. Just remember this one rule:

-Stay safe

That is priority. Your safety comes before telling stuff to your parents, on any topic. May it be gender identity, religion, sexuality, career choice, political beliefs etc.
If you do tell him though and/or it get's to their point you have to move out I would move in with your aunt. You'd probably be safer and happier there, being able to live with someone who accepts you. Which honestly will put far less stress on your life which should help with other things as well such as work, school, maintaining relationships etc.