Encourage your child to make personal connections to the content of the book he is reading. Talk with him and help him relate the book to his life experiences or to other books he has read. Write down the connections on sticky notes and place them in the book, or make a colorful chart together showing the connections. Visualization will help your child remember and connect.
Ask your child to predict what is going to happen next in the story. Stop periodically and ask her to predict again as she is reading. If it is a picture book, see if she can tell the story without reading the words -- just by looking at the illustrations.
Ask open-ended questions that cause your child to think more deeply. Don't restrict yourself to literal questions (such as "Who went to the store?" or "Who cried at school?), which can be answered from memory. Incorporate questions that require deeper thought (such as "Why did the character go to the store?" or "Why do you think the character was upset?").