We cannot be their Savior...only Christ can forgive them. We can pray their hearts and minds be receptive to the promptings of His Spirits convictions...but He will not forgive their sins from our voice to His...it must be their own voice who speaks to Him.
"And forge us our trespasses as we have forgiven those who trespassed against us" [Mt. 6:12]
"If you forgive the sins of any, their sins have been forgiven them; if you retain the sins of any, they have been retained." "[Jn. 20:23]
"You are mistaken, not understanding the Scriptures nor the power of God" [Mt. 22;29] :)