Thoughtless,
Unless you have given yourself up publicly. i.e. posted on a general website that has your name attached to it, your opinions that are contrary to the organization OR unless you have spoken publicly to 2 or more people at the same time regarding your opinions that are contrary to the organization, then I agree with daniel-p....just sit there are nod.
Procedure is procedure. If you are an adult, especially if you are baptized, the elders don't have the right to discuss your situation with your family. So, you may be overthinking this. They may simply want to take advantage of the "high holy day" to visit your family and try to encourage you.
If they meet with your family and try to discuss issues that pertain to you (as an adult), you should simply state, "If there is something that you would like to address with me, then I would appreciate it if you did so in private." In that way, you can control the situation and the blowback from your family will be minimal. UNLESS, however, your family is very loyal to you as an individual. At times, the elders will be very hesitant to make even the slightest assertion if they feel the family is gonna go balistic...
The fact that they want to meet with everybody seems like it is more shepherding than anything else. One thing is for sure, it doesn't help getting yourself worked up for it. One day at a time is the best way to live. I think Jesus said it best, "sufficient for each day is its own badness..."
SOP