If teaching them the ABC's one way isn't working, then try another way. With all of the resources we have today from books, internet, teachers, tutors, video's, there is little to no reason why a child can not learn to read.
As parents we only want what is best for our children. Does that sound like a broken record? Maybe, but it's true right? Once we grow up and have kids, our life as we knew it, now becomes all about them. All of our selfish behaviors are now selfless due to our children. We want everything the best from them but first, it starts with learning how to read. Here is another website I found to help you and your children.
Succeed To Read