Do siblings have a right to a copy of the will?

I am a little confused by your question as I am not sure whether you are asking it you can get a copy of your siblings will, or whether you are supposed to receive one by operation of law so I'll do my best to address both.

A sibling is not automatically entitled to a copy of a will, even if they are set to inherit from the will.

However wills are public documents so you can get a copy of a will either by going to the court that the will was probated in or by speaking with the deceased attorney (if he or she used on).

Hope that clears it up for you!