Even if the reading is too hard for them, they'll get the idea. Help them to use the library's computer reference system. It's a powerful feeling when they can type in a simple word and find, say, a shelf full of books about lions. Expect a wide range of interest. Encourage friends and relatives to send the kids cards and simple letters.
Most kids enjoy being read to long after they've learned to read well on their own.
If they don't, consider substituting a regular time when the TV's off, the phone goes unanswered and each family member reads independently. Teach by example. The kids will be inspired by seeing you look up information or hearing you talk about a book you loved. Limit TV and video games. Reading takes time and concentration.