Every Advent, the Church introduces John the Baptist, the prophet figure who proclaimed the coming Kingdom. He told people to change their hearts and lives, so God could enter.
Spiritual preparation for the season requires self-reflection and personal change. This is a good time for a church visit. It can be some quiet time for the family or an Advent Penance Service. Just bringing the family to church on a day different than Sunday will make an impression. And the change family members experience will be subtle, but will be add up.