There's no right or wrong way to do a family advent candle wreath. But here’s the liturgy I came up with for our family this year. It contains some responses, which are great for making the kids feel a part of things, and then it concludes with a traditional advent prayer of the week.
Leader: The people walking in darkness have seen a great light; on those living in the land of the shadow of death, a light has dawned. Come to us, O Christ the Light.
All: Come to us, O Christ the Light.
Leader: Jesus, light of the world, shine on us. Lights the candle(s).
All: Jesus, light of the world, shine on us.
Leader: Prays prayer for the week.
Week One: O Lord, stir up your might, we beg you, and come that by your protection we may deserve to be rescued from the threatening dangers of our sins and saved by your deliverance. Through Christ our Lord.
Week Two: O Lord, stir up our hearts that we may prepare for your only begotten Son, that through His coming we may be made worthy to serve you with pure minds through Christ our Lord.
Week Three: O Lord, we beg you to incline your ear to our prayers and enlighten the darkness of our minds by the grace of your visitation. Through Christ our Lord.
Week Four: O Lord, stir up your power, we pray you, and come; and with great might help us, that with the help of your Grace, your merciful forgiveness may hasten what our sins impede. Through Christ our Lord.