When we were growing up, after grocery shopping my sister and I would split everything equally and it was very clear that neither of us should touch the other’s half. Dire consequences and all. Anyway, she would generally eat her half right away, frequently all on the first day, whereas I would pace myself according to the next grocery trip. Which says something about our respective personalities. Same thing with Halloween candy. She ate the majority of hers the first night. I’d make mine last a long time. So long that she’d steal some, one at a time, later on, when her supply had vanished. I think she thinks I didn’t know. I knew. Older siblings always know.
I have no idea how 3 siblings did things. Like, an 8-pack of ice cream bars, how do you divide that among 3? Nothing seems fair, and fairness was my #1 value as a kid.