Apparently - blink and you'll miss it, in the UK anyway - this is Siblings Day. Or Sibling's Day. Or Siblings' Day. I am familiar with the arguments for the various ways of punctuating Mother's Day, but I feel that this one is a little different. For one thing, you can't be a lone sibling. So, what do you think?
While you cannot be a lone sibling, you may have just one sibling. I would go with "sibling's" because each sibling is individually included if there are multiple siblings, and a sole sibling is also included.
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While you cannot be a lone sibling, you may have just one sibling. I would go with "sibling's" because each sibling is individually included if there are multiple siblings, and a sole sibling is also included.