Question: I'm reaching out to see if the community can help identify a book (or series of books) from my childhood in the 80s.

To the best of my recollection, the stories were about a family of vampires - but they may have been nonspecific "monsters."

I believe one among them was considered very handsome because he looked almost human (speculation: implying the others had varying levels of disfigurement from their vampirism/monster-ness)

Wracking my brain for further plot details, the only strand I can eke out is possibly that the family of vampires wanted to take over the world, but one among them had misgivings; that's bordering on mistaken memory, though, I'm running on empty for more plot detail.

I remember thinking for the longest time that it was one of Roald Dahl's works; the tone of the story and artwork *felt* very Dahl-esque, but his bibliography reveals the work I'm referencing is not his. The work was aimed at the 6 - 10 age group, not really up to YA. I'm also fairly sure this was a series of books, not just one. The artwork was sporadic, i.e. it wasn't a-picture-a-page type of story.

I read the book in English, which I'm almost sure was it original language of publication; very likely it was by an English author. I doubt the work was from before the 70s, and it would not have been from the 90s.

I've trawled the internet searching for various permutations and combinations of vampire/family/80s/children's book to no avail. I didn't think this work was that obscure, but it apparently is; I'm hoping someone out there might have ideas what this may be.

Answer: 
I think this might be the "Gruesome and Bloodsocks" series by Jane Holiday.

The titular Gruesome was a vampire who was estranged from her family due to her vegetarianism, especially her reluctance to drink human blood. This didn't stop them showing up in her life and generally being rather antagonistic. She lived in - I think London - and had friends among the twentysomething student types there, her best friend being a boy called "Leotard" (not a misspelling of Leonard.)

So, although it didn't go as far as them wanting to take over the world, they were certainly preying on humans (she may have persuaded them to switch to farmyard animals in later books) and she DEFINITELY had misgivings about their way of life.

The cover art and the story illustrations were in very different styles. I do recall the in-book artwork being a bit Dahl-esque, maybe with tidier lines though. Not so much the cover art.

"I believe one among them was considered very handsome because he looked almost human" - I don't remember this, but I do remember one of them, Five-Fanged Francis, had a different appearance due to his additional fangs, and the vampires might have considered this handsome.

Other items that fit - it was in English, the target age group was indeed about 6-10, (I'd say more like 8-11 though), the artwork was indeed sporadic. I don't have the publication dates for all of the books, but at least two of them were published in the 80s.
I know of a few different vampire books. One is a series called my sister the vampire. The other is called something like "a totally lame vampire"