[Nearly] 4 year old girl:
Likes: Flowers, princesses, fairies, hearts, butterflies...you know, sugar and spice and everything nice.
Reading style: She likes to read to herself aloud. She can read nearly any word, but her attention span is more age appropriate. If a page has too many words, she has difficulty following the lines properly on her own (but that doesn't mean she wants help, she makes this clear)
6 year old boy:
Likes: Adventure, outer space, Star Wars, Legos, Magic Treehouse books...generally, snips and snails and puppy dog tails.
Reading style: He loves to read chapter books to himself. He can read through a Magic Treehouse book in a few hours, which makes me think perhaps we need to bump the difficulty up a bit. He is an avid reader. Print that is small might be a deterrent, making it appear to be too difficult.
What would you recommend?