I made an error, I meant to write that Mark was Barnabas’s nephew. he was the son of Barnabas’s sister’s. However he was present when Christ was arrested. He would probably have been about 12 to 14 at the time.
He was the young man who had his cloak taken from him when they tried to grab him but ran away naked from the garden where Jesus was arrested.
Also, Mark most likely got the information for his gospel from peter whom he traveled with to Babylon and most likely to Rome, when he met up with Paul while he was in prison just before he was beheaded by Nero.
Thanks for that post; it said everything I wanted to say better than I could have.
I await how he dodges my question and comment this time.