I think everyone agrees that with Such choices as Penn, Brown, and JHU, MDC makes no sense.
So, you must go to one of the three - in particular because, as the eldest, you’ll set the path for your siblings. And if you do well, you’ll be able to help them (I see that all the time - eldest child then helps youngest siblings with college, connections, etc.) If you don’t go, how likely is it that your siblings will even want to seek a similar opportunity and if they do, will be allowed to go (“I didn’t allow your sister to go so it wouldn’t be fair if I allowed you to” has actually been used ). Do this for yourself and for them.
Some points:
If you attend community college, you will have to pay for years 3+4 at the public universities. If the legislature keeps Bright Futures as is you’d have a scholarship that covers tuition, but room and board + other expenses will be 10-12k a year. Where will that come from?
Even if your parents think Penn= JHU= UF, certainly free v. 20-24k should matter. And no, there’s no special extra aid for students - Bright Futures is already very generous. You will NOT get a full ride as a transfer. It WILL be more expensive to attend college in Florida.
Read up on Christian groups on campus. Contact them. Know when they meet, how often. If there’s transportation to church every Sunday. Be ready to use that information.
Be able to compare crime rates on campus at MDC and your other choices. Just in case, learn about the neighborhood too. Know about the system people whose it is to walk you back to your dorm or anywhere. All the safeties measures. Don’t bring it up but have it at the ready. (all three universities have better security than MDC because they have lots of money).
Make sure you know if one of the three has single sex housing (guessing your dad won’t like co-ed dorms so have your facts so he can’t use that against you), substance free housing too. Don’t bring it up unless he does though as he might not have thought of that ;).
Enlist not just one but perhaps several trusted adults who can help - prepare them before they go talk to your dad. They have to be clever and diplomatic.
I agree with the phone calls from school officials all congratulating your parents for such a smart daughter, such an honor for the school, the community, a full ride scholarship to the best universities in the country. What if your school published the story in the school paper with it sent to the local paper? (Once it’d be public, it’d be hard for your dad to tell congratulating neighbors " ahem she’s not going").