Welcome SunnyMom,
Gifted has no agreed upon definition, but some set the bar at the top 5%, some set it at the top2% - since it has no definition, I urge you to look at the question - "How gifted (different from average) is my child in various areas?"
Here's one method to answer this question -
Dr. Ruf link to help you estimate your child's level of giftedness. The checklists start about halfway down the page.
http://www.educationaloptions.com/levels_giftedness.htm Getting IQ and Achievement tests in another way. Talent Search tests are a third. It's nice to have a professional's help to tie it all together, provided the professional is competent in your degree of gifted - which is logically, about as rare as your degree of giftedness ((small joke, but sadly true!))
Parenting these kids is wonderful and challenging - post here about both aspects, ok? I'm going to guess that you can't exactly talk freely with your neighbors, yes?
Smiles,
Trinity