Are there any relationship books that you would recommend or have helped your own relationship in some way?
Yes, there is some very good books and brochures that show how to have a successful marriage, such as the 192 page book entitled "The Secret of Family Happiness", with such topics as "Preparing for a Successful Marriage", "Two Keys to a Lasting Marriage", "How Can You Manage a Household ?", "Train Your Child From Infancy", "Maintain Peace in Your Household", "You Can Overcome Problems that Damage a Family", "If Marriage is at the Breaking Point", "Growing Older Together", to name a few.
Then there is a 32 page brochure entitled "Your Family Can Be Happy", with topics as "Look to God for a Happy Marriage", "Be Loyal to Each Other", "How to Solve Problems", "How to Manage Money", "How to Keep Peace with Your Relatives", "How Babies Change a Marriage", "When Tragedy Strikes", to name most.
And both of these, along with much more, is found on the JW dot org website under PUBLICATIONS.