More parallel, although I don't know anything about a book called Holy War.  

The first four books are one story arc, he had publicly announced that he was done with that universe for at least a decade when he turned in the fourth book, fan clamor resulted in the coauthored books.  Yellow Eyes, Watch on the Rhine, and The Tuloriad run in parallel to those first four.  The Cally trilogy is several decades later, primarily following Cally O'Neil and expanding the story of the Bane Sidhe.  John barely salvaged Honor of the Clan after my ex went nuts while writing it, he didn't have time to really clean it up, so there are some continuity gaps if you know what to look for (that also coincided with our divorce).  For a novel that was supposed to be 120-140k words, he wound up deleting 85k of emo drivel (and the publisher had multiple editors look at it and confirmed that he wasn't just being pissy, it really was that bad, part of why it's unlikely she'll ever write for them again, even if she does have a ten year old outstanding contract).  Eye of the Storm follows fairly closely on the end of the Cally trilogy, and is supposed to be the start of a final trilogy, but John wrote himself into a corner, he tends to get rolling along writing and doesn't slow down to make sure he doesn't go too far in a book.  I also think part of why he can't finish that trilogy is he's got more story than will fit in just two books, but it can be very difficult to guide him into finishing something.  It's very easy to disrupt his writing mood and throw him off for weeks or months, I've seen it happen multiple times over the years; he'll be rocking along, excited about a story, go to start writing it, and someone shows up at the wrong time, his wife gets sick, cat dies, etc, and he loses whatever momentum and almost gets a block from finishing whatever story he was working on.

Go for it.  She's got full on TDS and appears to support BLM.  Did I mention that she's bipolar and that her meds quitting working was a large part of our divorce?

No harm, no foul.  The only reason I even pay attention to anything in her life is our daughter shares an apartment with her and she sometimes drops information that our daughter has forgotten to mention to me or my wife (yeah, I traded up, younger model, no mental health history, actual conservative, etc... No pics, she doesn't like them online :-) ).