The reason for different words in the Church of Scotland's Hymnal is the kirks downplaying of the role of Mary with some areas of belief not even acknowledging a virgin birth, therefore the line that is changed is "round yon virgin mother and child. This is replaced with Mary and Joseph in stable bare, watch o'er the infant beloved and fair."

This is the words as I remember them.

Silent night, Holy night,
All is calm, all is bright,
Mary and Joseph in stable bare,
Watch o'er the child, beloved and fair,
Sleep in heavenly peace,
Sleep in heavenly peace.

Silent night, Holy night,
Shepherds first saw the light,
Heavenly hosts sing hallelujah,
From far and near, the Angels sing,
Christ the Redeemer is here,
Christ the Redeemer is here.

Silent night, Holy night,
Son of God, love's pure light,
Love is smiling from thy face,
For us now the hour of grace,
Saviour since thy birth,
Saviour since thy birth.