Here are some devotional material ideas for individuals or families:
Tracing Glory: The Christmas Story Through the Bible by Sarah Rice
Good for families with younger children through elementary school. Includes questions at the end of each day and key scripture passages.
Why Christmas? by Barbara Reaoch
Good for families with younger children. Includes scripture passage, questions, and a song for each day.
Come Let Us Adore Him: A Daily Advent Devotional by Paul David Tripp
Good for individuals or families. Includes scripture passage suggestions and recommended discussion points for parents and children.
Good News of Great Joy: 25 Devotional Readings for Advent by John Piper
Good for individuals or families. Scripture passage and short devotional for each day. Can be downloaded for free at desiringgod.org.