As you've pointed out in #2 there won't be a 100% safeguard against fraudulent information but we do what we can to minimize them. I did like the fact, as I've read in your TOS, that parents can contact you via phone as well as e-mail and forum.
Yes, a good teacher's interest should focus on the well-being of the child and their families. Creating a resource network geared for families is a great idea. It has been done before but there's always a need for more. Especially in today's society the focus of the family structure has gone a bit off-course and I think it is in our best interest to build it back solid. A community such as yours will give families a fighting chance.
I praise you for what you're working towards and I hope that your community will flourish.