My girls really don't share well. They're young to share, plus Deborah has a strong 'MINE!' streak in her.
Except for reading. The two of them can sit for a shockingly long time together with a book. It's a delight to me that they both enjoy being read to and looking at books by themselves. They both make up their own stories based on the pictures, or try to remember the story they've been told.
Yup, they're doing good as far as books go.