Siblings using the skills with each other

If one child wants to come in on a game that two siblings are playing, but the other children don't want her to, would the 2 children give a no answer, or should they ask to disagree appropriately, or.something else? How do I Ballance the need of the (younger) one to accept a "no" answer with the need of the older 2 to include their younger sister and be kind. (Younger one is quite dominant and demanding).

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