The Genealogy of John Mark

I'm inclined towards believing every Mark/Marcus mentioned in the New Testament is the same person (and that person was never in Egypt).  But if they're separate we know the author of the Gospel According to Mark is the Mark associated with Peter, 1 Peter 5:13 and Acts 12:12.

Acts 12 in verses 12 and 25 link a "John whose surname was Mark" to both Peter and Paul and Barnabas.  Individually both of those were common enough we can't assume two people are the same simply for having that name.  But together it's a lot less common and I feel Acts 12:25 would only repeat the exact same wording as verse 12 if they wanted to tell us they were the same person.

Peter refers to Mark as his Son in chapter 5 verse 13 of his first epistle.  Most people don't take that exactly literally, or rather not biologically, but what if it is?  In Acts 12:12 Peter is liberated from prison and heads to the house of a Mary the mother of John Mark, maybe he was going to the house of his wife and son?  In 1 Corinthians 9:5 Paul says that all of the Apostles but him and Barnabas are married.

Now Mary was an insanely common name, so many are quite annoyed at attempts to identify different Marys with each other.  But I a made post last year arguing the individual Paul called Kepha was actually Mary Magdalene not Simon Peter.  I made a couple pretty strong smoking gun arguments, but the fact remains John 1:42 clearly identifies a Kephas with Peter.  What if it was because Peter and Mary Magdalene were married that this title became one they shared?  And Paul chose to use Petros for the Husband and Kepha was the Wife?

Next is the question of how Mark is related to Barnabas.  In Collisions 4:10 the word sometimes translated cousin or nephew (and "Sister's son" in the KJV) is a word for relative that doesn't really seem to be that specific.  This is the only time the New Testament ever uses this word, but it seems like there may be precedent for it not being a literal biological relation at all, and maybe Paul is just using it here because of the connection Mark and Barnabas had in Acts 15:36-39.

When we're first introduced Barnabas in Acts 4:36 he's described as being from Cyprus.  Later on he and Mark together become strongly tied to Cyprus in Acts 13 and 15:36-39.  I also argued for the possibility that Magdalene and Mary of Bethany are the same.  And there are some early traditions that suggest Lazarus and his Sisters fled to Cyrpus sometime soon after the events of the Fourth Gospel.