[Avodah] Mourning for a parent

[Prof. Levine]

At 05:23 PM 6/14/2012, Simi Peters wrote:
>One does not have the same halakhic obligations to a spouse or 
>sibling.  A relationship with a spouse can be severed by death or 
>divorce, so one's obligations only obtain within an existing 
>relationship.  And one is not commanded to honor or fear a sibling.

I do believe that one is required to give some honor to an older sibling.