Using the translucent pieces from Handwriting Without Tears, children put curves and lines together to form the letters of the alphabet. Take two long lines and put them together at the top. Then use a short straight crossed in the middle to form a capital letter A.
As you play with your children talk about the different letters and the shapes that form those letters.
Play copycat games to see if you can both form the same letters.
As your child learns the shapes and names of the letters you can also mention the sounds of each of the letters.
Soon your child will know all 26 capitals as well as the 26 small letters of the alphabet.