
I love how everyone agrees that none of this excuses his behavior, but honestly I only have compassion for animals and children, so I’m kind of ashamed to admit this works on me :( not because it justifies anything but because it’s genuinely sad. Of course that only applies for the baby version, the adult version needs to go to jail.
Also, I think someone mentioned it in the comments, and agree, that this is probably just to give some background or explain how he ended up like this, not to excuse or justify anything. (And just to be clear, nothing justifies rape, nothing, not trauma, not a sad backstory, so we still hating on him, but we can still be sad for the baby)

I am on chapter 20, the read is too painful and frustrating. Don't get me wrong, I love it, I wouldn't get past chapter 10 if I didn't. But please can someone tell me if Lister is dead or at least getting what he deserves (Death), and what was the original deal with is sister, what's wrong with the medicine (Please don't answer me just to tell me that I should just read and it's worth it, my brain is tired)

Trying to only answer the questions you asked and not give away more
Lister is not dead
We still don’t explicitly know what they deal was with the sister but she is involved in the incident that lead sylhan to become like this
We don’t outright know what’s wrong with the medicine but it’s heavily implied that it caused negative symptoms and made memory loss worse
I quite enjoy the story, if you leave aside the rape which is enough for me to hate this tbh (I have mixed feelings about) but if I think of this as fiction only, then it’s fine, I don’t have to get my emotions and morals involved (this chapter was hard to read so I scrolled and tried to read only the important stuff for me to follow the story)