Well the Gabi and Santiago thing has been discussed at length with no real consensus. Many of us think that they are married but then that would surely risk breaking the dreaded "incest" rule on Patreon, even being his Step Mom would be very risky from what I've seen. Patreon clearly says:
Not permitted
- Real or animated works (photo, video, written, audio) featuring sexual activity or role play interactions between family members who are blood relatives or part of the same immediate family (e.g. siblings, parents, adopted children, step-siblings, step-parents).
We will see what Nyx does with this, but if he is anything other than her husband or brother it would be pretty weird to me why she would have a massive picture of them together on the wall at her place. Unless they aren't married but the picture is of them at someone else's wedding.