There's just something so like wild to me about how some people treat brothers mercenary duo. That like Punz must have abandoned and be cold and cruel to Purpled.
But I think you can give Punz more nuance while still making them not on the best terms and validate still having a very weary and hurt Purpled. The age gap of the CCs is about 7 years. If you want them to be biological brothers or even found brothers, there's every chance that if Punz was responsible enough for Purpled long enough that Purpled feels a sense of abandonment Punz could have been a kid or teenager too. One probably woefully unprepared for taking care of another sentient being.
Tbh I think that's a much more interesting play than just going "Punz was abusive to/abandoned Purpled". Like do that if you want, im not gonna stop you. But "Punz was a kid/teenager and woefully unprepared to handle the physical and emotional needs of an even younger kid like Purpled" is just more fun for me.