Shit, man... I don't have much memories of when I was that little, but I feel like I also worried about whether my sisters liked me or not. Definitely remember rough housing and personalities clashing, but at the end of the day, with us as adults? We get along pretty damn well. Much better than with our parents, especially our emotionally unstable and abusive father. We needed each other to survive that shit.
Fortunately, none of the characters here seem to have that problem, at least. But the neglect aspect of the Hori household certainly is familiar, as when we weren't being emotionally or physically abused, it feels like we were being ignored as 'too much trouble' to manage, a set of three girls and their little brother all within about a 5 year age range.