Devotion to the Precious Blood of Jesus is an ancient devotion, one that has biblical roots in venerating the blood of Christ poured out for all humanity.
Here is a traditional prayer to God, asking for grace to be poured out upon all your friends and family members, through the merits of the Precious Blood of Jesus.
Eternal Father! I offer Thee the merits of the Precious Blood of Jesus,
Thy well-beloved Son, my Savior and my God,
for all my relations, friends, and enemies;
for the poor, the sick, and the afflicted,
and for all those for whom you, my God, know that I ought to pray, or would have me pray.