Returns the first child of the parent of a member.
Member_Expression.FirstSibling
A valid Multidimensional Expressions (MDX) expression that returns a member.
The following query returns the first sibling of fiscal year 2003 in the Fiscal hierarchy, which is Fiscal Year 2002.
SELECT [Date].[Fiscal].[Fiscal Year].&[2003].FirstSibling ON 0 FROM [Adventure Works]
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