I have become a consultant and I didn't even need a demo to convince my DH as he was googling it watching videos lol
If you find a nice consultant (if I was near you I would!) then they should be happy to do a demo for just your family.
With a normal demo you need a min of 3 guests (and normally a Max of 6). If you have the demo you are entitled to a free thermosaver when you purchase your TM. If not you can purchase it for $60