Minecraft 2 Xbox, 2 accounts and one wifi. Will it work?

Minecraft 2 Xbox, 2 accounts and one wifi. Will it work? - 1
Added (1). I have my son and daughter who both have an xbox and have their own account each. My question is my son has MineCraft and wants his sister to have it too. But can they play in each others world being on the same wifi?

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