
Hi peeps, to see the bigger picture of this manga, I'd like to suggest to try to read the latest comment here:
https://m.manhuagui.com/comic/33189/
Just translate the page into english, of course it's rough and rather confusing translation but personally i get the gist of it, you know.

She's kinda turning into her mother in a way.... I guess?

It doesn't really show their relationship or how the lil sis view their mom. You can read the oneshot for your own interpretation http://www.mangago.zone/read-manga/bad_candy_you_give_me/nbt/mpn_chapter-2050426/pg-1/
Lmao so in a way i can say that our mc dies (socially) a heroic death for the betterment of this random mom-daughter's relationship. My condolence goes to him.