Wow - they are extremely left-wing. How frustrating for you! And very kind of you to let them know you are prepping so they know where to go when the time comes.
My son and daughter-in-law are the only ones I’d take in. The others - my mother and sister and their husbands - are thousands of miles away so I don’t think it would be an issue.
They are as far left wing as one can go. Obama is not left enough for them. They hate big companies as companies don't give ALL their money to employees (and he works for a big company and hates them at the same time.) They want completely free medical care for everyone. There is no way to describe how left they are - complete radicals. Both are hippies who never gave it up.