We have always been PTO but I will answer your questions
1. We count all family members as PTO members--aunts, uncles, grandparents, anyone who plays a part in the child's life. We also count anyone acting as guardian of the child. Many of our families are raising children not their own biologically and we want anyone who cares about kids to be involved.
2. We do tell them that several times throughout the year. We have started having more regular communications this year than ever before and that has helped our numbers of volunteers.
3. We do not charge dues because we do not feel members should have to pay to be involved in their child's school.
4. We ask but do not require that members volunteer one hour per year. Setting a specific time limit has also helped our numbers. People who want to do more, do more. And others feel good that they know they won't be continuously called upon to volunteer--they won't fall into the black hole, so to speak.
5. We are matter of fact. We explain the benefits both they and their kids receive from volunteering. I used a top ten kind of list that I found on these boards and got a great response from it. Both parents and the admin thought it was great.
6. & 7. NA
8. Our numbers at meetings are small, though higher than last year. That seems to be due to our increase in communication, our limiting the time we ask people to volunteer, and a willingness to be open to ideas an inclusive of people. What is important, I think, is that we have people who give whatever they can and know it will be appreciated. I am real big on thank you's, even if it's just for attending a meeting.