My son is 7 years old, but he is just starting to learn Greek, so we are starting with the basics. It’s been difficult to find age-appropriate children’s books that clearly teach the Greek alphabet, sounds, etc. We bought some workbooks and flashcards, but I found a great video online that is helping him learn the order of the Greek alphabet and the names of each letter. For older children or intermediate speakers, there are additional tips like dipthongs and double consonants.

Hopefully your children can use this as well:
Modern Greek Alphabet Video — by CreativeCrackpot

For fun, my son loves this one, but the letters are not pronounced in Modern Greek:

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