Does everything have set owners and others have to ask permission to use them? Do you have a few prized possessions that are not for sharing but everything else is fair game?
I have four daughters, one is a baby.
DD1, the eldest, is awful at sharing. She'd rather hide belongings than let her siblings play with them. If a sibling finds something that belongs to her, even if it's something she hasnt shown any interest in in months, she'll demand it back instantly.
The younger two are much better at sharing but more so with each other than eldest dd. Eldest dd will approach them to play by taking whatever toy/figure she wants to play with and is very concerned with everything being fair. However, she expects to be able to share anything she wants but for all her belongings to be sacred. Interested in what others approaches are to sharing.