O glorious and good St. Joachim and St. Anne, saints of God’s tenderness, who lived in the presence of the Holy Family: I entrust my grandparents to you. Intercede on their behalf and lead them to Jesus, your beloved Grandson, who is the God of love and everlasting happiness and peace. Amen.
From: Prayers, Promises, and Devotions for the Holy Souls in Purgatory by Susan Tassone, p. 131