While I agree that there isn't a scene where we see Perry hugging Celphi, in my opinion there's just no particular reason. Yes there were probably moments where she could have hugged him, she may have done in the rough drawn storyboards but it was taken out because the chapter would be too long, a scene change, a time-skip, they ran out of time to fully draw, colour and shade it. There could be multiple reasons why we don't get to see that but I don't necessarily think it means that Perry doesn't have affection for him. In my opinion I don't think she's keeping any of the family members at arms length so I don't know what bits you're looking at that give you that impression.
still have a major problem with the MC's inability to hug her son - if she cares for him & feels for him, how come until now she is incapable of showing the minimum of affection??
she wont even hug that little girl & it's starting to annoy me - r those kids just props in this webtoon?
she has No problem hugging the ML (which i aint begrudging, & i love how their relationship grew naturally & logically) but if she has no problem with his curse - why she keeping the kids at arms length??? just weird & annoying to me the only down side i can see in this plot until now （/TДT)/