If you don’t own a copy of this then grab a copy now.  The hardback is on sale for $10 and the Kindle version is $2.  This is a fantastic resource for both your children and adults alike.  It does a fantastic job of showing how the whole of Scripture points to Jesus, even taking something as complex as Isaiah and making its message about Christ easy enough for small children to grasp.  I greatly appreciate that the hermeneutic here is not based upon a few scattered proof texts here and there but an understanding of how the various narratives, themes, and persons in Scripture all anticipate the coming Messiah.