For us it would be to grab some clothes, keepsakes, essentials... open gates, and cut fences if necessary, for the cattle... You take what you can gather. load some that are special in a trailer, if there is time or special bloodlines.... get the dogs/cats if possible that are "family"... and turn the rest loose and PRAY. If there is a way for them to save themselves, they will.
We cannot possibly move several hundred animals in case of a natural disaster...
People are worth more than the animals...
You need to have some things already packed.... a "go bag".... if the weather starts getting threatening.. some medical supplies. Full tanks of gas in vehicles...
We get an occasional small quake here... have had several twisters in the area... nothing to do but find a place to hunker down or get out of the way if possible... We get some severe flooding in the mountains here.. case in point in southwest Va, eastern TN, western NC... the devastation of the flooding...
W get alot of icy conditions, some years snow... feeding ahead so that no one has to go into places that aren't safe to be..until the worst of the storms pass. Provide shelter and windbreaks if possible..
Drought is a condition you can plan for... buy extra hay/feed ahead as it gets dry... sell animals that are not paying their way to cut down the stress on the pastures... no free loaders allowed.....
You survive it so that you can go back and pick up the pieces... All the worrying and hand wringing is not helpful, will not change what happens: except the way you prepare for it ahead of time.
It is not your place to worry about all this... it is your parents. And it is not your place to question what they decide at this point. They hopefully have the best interest of the WHOLE family foremost in their mind. You do what you are told and accept that they cannot stop a natural disaster...
Afterwards, like
@Baymule said... you cry, you get mad, then you accept that there was no other choice and you pick up and start over.... fix what was... and go forward.