A parent's right to be involved with their child's education starts with having the ability to choose how their children are educated, be it at public and private schools, or being home schooled. Affordability comes into play with this issue, which can hinder choice. An example of making other options more affordable includes "equal access". Purchasing all the necessary resources to homeschool a child can be extremely expensive. A few states like Wyoming allow homeschoolers access to classes or sports part-time. Since the parents are paying for public education through their taxes, they should be able to access public resources.
Another important part of being involved with your child's education includes the following:
to understand the principles, aims and programs of formal education so that they can support, enrich and provide home follow-through to school programs. At times, parents have also found it necessary to have this basic understanding in order to provide external remediation or tutoring.
to have their child excused from programs or prescribed reading which offends the values of the home, when specifically requested
to consultation before fundamental changes are made which affect the parents, the child, or the total school climate
to participate in evaluation procedures affecting their child's programs, and in formulation of policy, goals and shape of education
to be involved in the event their child is to be suspended from school. The student has the right to "due process" and parents and student are part of the affected parties to be heard before judgment or action is taken and before the student is suspended for just cause.
I borrowed these 5 points from the following website as they have stated it clearer than I ever could.