Skydancer

1. You believe you are at real risk, so you need to get out.
2. You can't safely access your primary ID documents, so don't (or if possible before leaving town, go the APS rout suggested by another commenter). Take any secondary ID you have with you and replace primary ID later.
3. This is the one you seem least sure about, but you've identified your best safe destination, at least to start. Go to your Democratic relatives, and plan next steps from there. I'll add to this and other "what" questions in a reply

Nobody is in a better position than you are to judge the seriousness of the situation. Trust your gut and get out.

1. Convincing a liberal friend to drive you to a red state within a week of the election is a tough ask - even if they are willing and have the time, they may not feel safe doing so. If they do, they're also more likely to downplay the risk from your brother. Most people who can do this are not working: retired, unemployed, or stay-at-home parents.

Unemployed friend should be your first choice here: probably happy to make the trip if you cover gas and lodging. Stay at home parent is less likely to be able to get away because of the need to handle childcare. Retired people you know are probably also connected to your parents, which make them riskier options.

2. There are also websites and apps for pairing strangers with and without cars going in the same direction. Usually the person with the car will want gas money from the one without. This is a riskier option for you. It may also take longer and require you to make temporary arrangements to stay somewhere locally, and even then not work out.

First, don't use Facebook for this - too easy for it to get back to your family. Use your favorite search engine or app store to find a "road trip carpooling" tool. Probably as manybas possible, if you choose this option.

With your disability, you're more vulnerable to unsympathetic or even politically hostile drivers. When they ask about your trip, don't tell them why you left. You're going to visit family you haven't seen in a while. Talk about things you've done with them in the past, and what you're looking forward to doing with them now. Don't mention things that convey their (or your) politics.

If you're paired with a MAGAt or someone who holds otherwise objectionable views, do not push back. Express indifference, or even agreement if that's what it takes. You're vulnerable both because of your disability and because they control your transportation - you don't want to be stranded at the next rest or gas stop.

Show up over an hour early - preferably two, I don't know how muvh your disability may slow things down. Check-in is probably at a kiosk. Then ask the first uniformed person you see for mobility assistance. With your standing issues, that will probably mean someone to push you in a wheelchair to TSA. Documentation of your disability may help here, but shouldn't be necessary.

After TSA, they'll probably send a golf cart to rake you to the gate. Once boarding is called, disability should make you eligible to board at any time. If you need to lie down to keep enough cognitive ability to recognize the right boarding call, do so, and explain to any official that tells you to sit up (but they probably won't). Ignore any passengers that say anything about it - you don't have to answer to them.

When you board, make the flight crew aware of the cognitive issues with sitting. Ask them to tell you specifically at each stop if it's time for you to exit the plane.

When you arrive, ask for mobility assistance again. There will be a taxi stand at the airport if you need that. You may not want to call ahead to your family even then, so you can make your request in person not to contact your brother and parents.

Again, you can buy tickets online. I recommend this, as they sell out. If buying and printing the ticket at home is not safe, you can still plan the trip and then buy at the terminal if there is one - but it limits your starting point options to actual terminals (not all Greyhound stops have them). The ride will be long, cramped, and you will almost certainly have to change buses at some point. Bring something to do that won't run down your phone battery, like a book or knitting.

There will be less assistance than with flying. Lying down at the station is more common, but if they're full they're more likely to make you sit up despite your disability. There will be stops where you can buy food. There won't be a taxi stand at the other end, but there will almost certainly be a local bus stop.

Do you have a rolling small suitcase you frequently use for taking things with you when you go places nearby? If so, pack what you can in that. Ignore things that can be easily replaced (personal care items, fashion clothing, etc) and plan to replace them when you get where you're going. Thrift stores are your friend. Focus on things of emotional, medical, or financial value. If there's room left, pack underwear since that can't be gotten used.

If leaving with anything would be unusual, don't. Getting you out is the most important thing. Everything else is secondary. If you go the APS route for your ID, they can help you retrieve some belongings at the same time. Otherwise, plan to figure it out later.