It seems rather odd to speak of islands "belonging to" other islands. One vetter did suggest that "are in the same group as" (or words to that effect) might be better.
Rona and Scalpay are two of the largest islands in the group, after Skye itself and Raasay (and possibly Rum), but you could be forgiven for never having noticed Isay on a map. (Look to the mouth of Loch Dunvegan, in the extreme north–west of Skye.)
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