In our experience the following books are the best on Christian life coaching.
Transformation: Chapters on the dysfunctional family and boundaries.
Hidden Keys: Classic book on gender differences; half of him and half for her.
Love and Respect: Women need love and men respect or you end in the crazy cycle.
The DNA of Relationships: Classic book on taking responsibility of for yourself.
Attachment: Classic Christian book on attachment that determine how you attach.
Safe Haven Marriage: Application of attachment to marriage.
His Needs Her Needs: Classic book on gender needs and basis of the "love bank theory."
Love Busters: Identifying and removing the negative in the marriage.
The Languages of Love: The five ways we want to give and receive love.
Boundaries for Teens: How to set boundaries for yoiur teens.
Boundaries in Families: How to set boundaries in your family.
Boundaries for Children: How to set boundaries with younger children.
Love and logic for Children: How to parent with both love and consequences.
Parenting Teens with Love and Logic: How to parent teens. Many unique ideas.
Before a Bad Goodbeye: Why marriages fail and how to save them.