Keeping a marriage fresh and wholesome takes hard, consistent work. Dr. Swindoll hints at six characteristics from Ephesians 4 that need to become habits for a healthy marriage.

The Bible is central during family devotions. You don't ever need another book in that setting if you don't want it, as long as they're being read elsewhere.

But I have heard good things about The Big Picture Story Bible from Crossway books. The people I respect really admire it. It's a book for kids, but it covers the whole range of Scripture and is theologically solid.

You can find lots of books to use. Either way, mom and dad should be reading books to children all the time, and not just during devotions.