It was the 90s since I last played 40K apart fro a short stint playing Dawn of War.

I found this on Reddit but I’m site-banned so can’t ask there. My rough grasp is…

• The crowned woman is a famous eldar princess type thing?
• Ultramarine Primarch (Robert Gullman?) is her dad? That doesn’t make sense…
• She’s pregnant with his kid??? How can humans and Eldar have kids? I didn’t know that was possible.
• The Emperor is pissed that Ultramarine Rob shagged the eldar?

What did I miss/get wrong?