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Gets the parent of current group.
Use this property to navigate from a nested group to the group that contains it.
IGroupInfo Parent { get; }
ReadOnly Property Parent As IGroupInfo
worksheet.Range["2:8"].Group();
worksheet.Range["3:5"].Group();
IGroupInfo parentGroup = worksheet.Outline.RowGroupInfo[0];
IGroupInfo childGroup = parentGroup.Children[0];
IGroupInfo group = childGroup.Parent;