Who remembers A Catechism for Boys & Girls? This was one of its covers, but I think it is now out of print, (although I am double checking on that - anyone with any info please let me know). It has been a popular catechism amongst Baptist churches over the years. Interestingly it has been used as the basis for a new series from Christian Focus Publications (although notably the questions on Baptism have been edited out - with permission!).
Big Bible Answers is a series that aims to bring doctrine and theology to children. Using the questions from the catechism, Bible and real-life stories demonstrate each doctrinal truth. Scripture references and 'Talking it over' points are added at the end of each story. For example, we learn about Galileo's astronomical discoveries in considering God the creator, we hear about the prophets of Baal and Elijah in learning about the one true God and Patrick of Ireland is used to teach us about prayer.
This looks like it could be a useful series and I particularly like the foreword:
As parents one of our greatest concerns is the spiritual condition of the hearts of our children...
...What parents need most is a deep realization that salvation is a supernatural work of God through the hearing and application of the Word, not a work of us as parents per se. For this reason, the salvation of our children must not be the goal of parenting but rather our desire given over to the will and purposes of God. What parents need next is to fix their hearts on the goal of faithfulness to God, for the glory of God. The chief end of parenting is to glorify God by doing what He has asked us to do as parents: be faithful to bring to our children His love and care, our changed lives, and above all, His Truth, both taught and practically applied