Returns the siblings of a specified member, including the member itself.
A valid Multidimensional Expressions (MDX) expression that returns a member.
The following example returns the default measure for the siblings of March of 2003, which are January 2003 and February 2003, and including March 2003.
SELECT [Date].[Calendar].[Month].[March 2003].Siblings ON 0 FROM [Adventure Works]