Thank you KL, 2010BEBES and mirra
2010BEBES, I did not use many flashcards with him because HE DOES NOT CARE FOR THEM at all!!
Whenever I tried to flash, he either ran away from me or told me "no no". So, I let him watch LR because he simply enjoys watching it. I let him watch it 2-3 times a day
and just follow LR curriculum.
The only flashcards he would care for are those of Rudolph Flecsh. However, I only flashed those cards to him when he is in a very good mood. If he looked away, I stopped and tried again in the next day or two.
I have started using Flecsh cards with him last month so I don't think he read because of them. I do think LR is what taught him to read.