There are severall books you can find in any bookstore that can help your kids with geometry. There is a Geometry For Dummies book, as well as many other good self taught books in geometry. Go to any local bookstore such as Barnes & Noble or Borders and search in the education section.
You could also find these books using a Google search or at Amazon.com. If your kids are really struggling, the books might not be enough to help them because they have to teach themselves particularly if you aren't good at math either. The books will teach the basics but might not cover all the material that is taught in the classroom.
You might want to consider hiring a tutor as well. I have been tutoring math for 11 years and know there are many good tutoring websites available, such as tutorsteach.com, liveperson.com, tutornation.com and tutors.com. A Sylvan Learning Center will also help but they can be quite expensive.
Another option is to contact your kids' school to see if they have a list of tutors available. Good luck!
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