There is also a small point about the theory of Zoe as the possible mother of Nami and/or Nika.Dev mentioned that the plot of SG is less criminal than Wiab. Zoe mentions more than once that she wants to start a porn studio. Don't you think that the porn empire, as a legacy, although in the gray area,but is many times better than the main business of the Zanes.
As for Holgerson, it seems he left the family business and may have started working with Katie Zane in the fashion business and at the same time running shady schemes.
But it’s too early to build theories about what’s where and how. In Wiab, Uncle Tony and Aunt Jenny have already been mentioned, their children and seemingly different uncles and aunts. Plus *fucking grandma*, the ups and downs of Helen and Dylan’s relationship
(I wouldn’t be surprised at Dylan’s bastards on side). I wouldn't be very surprised if they were all Petrovas and Reveras(uncles and aunts). Well, the most important thing that 23-24 years passed between Wiab and Sg. From the beginning of the events of Wiab to the birth of many of the SG heroes, 2-4 years passed. Everything could still change 100 times. I wouldn’t be surprised if Dana still breaks up with Martin and ends up becoming the mother of Vanessa and Zara.