What was the relationship between Cleopas and Peter?
Cleopas and his companion went back to Jerusalem. The Eleven told them that the Lord had been raised and had appeared to Simon. Luke 24:33-35
What the Bible says
Luke 24:34
Saying: The Lord is risen indeed, and hath appeared to Simon.
Luke 24:35
And they told what things were done in the way; and how they knew him in the breaking of the bread.
Douay-Rheims Bible (Challoner revision), public domain.