You do not say where you live, but from the brand name of your meds I will assume that you live in the USA.

It is very hard to commit someone inpatient for his or her relatives in this country. Very hard.

Notify your doctor that you have these paranoid fears and try to relax - listen to music or what not. If that helps, post the paranoid story of what, step by step, your family is going to do to commit you. Maybe it will help you see it for the unreal fantasy that it is. Or, write it down for yourself, without posting. A few months ago, still depressed, I had a nighttime fantasy that would not go away. In that fantasy, I checked myself into a locked unit because in my mind I was presenting a danger to others, and precisely, to my ex's girlfriend. In reality, he does not have a girlfriend and he does not plan on having one. I could not fall asleep until I got up from my bed, went to the computer, wrote a letter to him detailing this story, and saved it in drafts. Then I fell asleep, at last. My p-doc told me that I did the right thing writing down the fantasy. Try it.