put him or her in school!
First they have to know phonic sounds, songs really help then it's just about practice.
Buy them picture dictionaries, audio books, etc.
Try rhyming words
First let him be familiar with the alphabet. Its better if he memorize them.. then teach him the sound of each letter give him sample words.. ops teach him what are the consonants.and vowels. Teach him the sound of each vowels as well.
Thats good. I hope she learns it fast. :)
Read storybooks with pictures to them from when they are small. That should get them curious about learning to read. After that, just let them take it at their own pace, some kids are more interested than others and some learn faster than others - either way they will get there in the end so long as you are providing them with enough opportunities to practice reading/writing and listen to stories.
Find out what they're interested in, then get them books about that subject. That way they'll want to keep getting better at reading on their own so they can feed their own curiosity.
Leave a note telling him where dinner is going to be served.