Recommendation for Small Group on Marriage or Parenting?

I received this question via email and wanted to throw it out to you all for your counsel and suggestions:

“I was wondering if you have any suggestions for good, Christ-centered, books regarding parenting or marriage for my small group. (We all have kids under four years old). Discussion questions would be helpful.”

So what would you guys recommend?

Thanks for sharing your counsel–

Love,
Tara B.