I used a FREE program with my triplets for over 2 years. It's called Letter Of The Week. Go to www.letteroftheweek.com. Select your child's age and you will be given free lesson plans to help your child learn. There's even a Yahoo group for suggestions and support.
You can tweak it anyway you'd like but here's the basics.
Week 1 - Letter Aa
Post a print out of the letter Aa on the wall or fridge or buy a big bulletin board. Each day discuss the letter Aa and the sound it makes. Color a coordinating picture like an apple, ant, etc, each day and post on the wall during the week. You can also do field trips to coordinate like a trip to an apple orchard. You can do science type things like cut open an apple and discuss the different parts like skin, stem, seeds, core, etc. Then have an apple snack. Do a scavenger hunt looking for Aa words around the house or yard. Be creative!
Week 2 - Letter Bb
Review your letter from last week and it's sound and take down your pictures. Then start your Monday with the new letter. Read coordinating books, color a picture each day, go on a field trip to see boats or bikes or birds, etc. Find a fun Bb snack. Keep your daily pictures on the wall for the week. We kept ours in the dining room where we ate so we'd talk about things every day and bring the topic back up.
Do this every week including the summer. Make some fun summer events using your letters. You don't have to do the letters in order. You can also create a letter book. Put a letter page in a book to create an alphabet book for them to go through. Use flash cards.
You can also do Reading Eggs, which are great! Go to www.readingeggs.com. They give a free trial. It's like games to learn and boy do the kids learn! My triplets have been using it for months and their new kindergarten classes use them too. It will cost you after the trial but it is well worth it.
I think you'll find after your son is in a classroom that he will learn. At home he is relaxed and just may not have an interest but once he's with other kids and in a routine he will learn and enjoy it!
K. B
mom to 5 including triplets