I haven't explored Paul's possible descendants. There is some speculation by scholars that Paul was frustrated in marriage, and particularly he didn't gain the wife he wanted/coveted. The New Testament portrays him as single/celibate, but in the royal family that did not mean much. Under his alias Simon Magus he cavorted with "Helen".
Also didn't know there was a reputed marriage between Paul/Saul and the daughter of Jesus and Mary Magdalene. What is your source for that?
As far as Costabarus (I & II), see the charts at the bottom of the book index page:
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