It’s a sin to absolve someone else of their obligations under Torah.
Why would this absolve them of their obligation? Just because Jesus is personally seeing to his own obligation to ensure his mother is cared for in no way absolves any other [half-]siblings.
44 posted on 10/08/2014 1:15:13 PM PDT by OneWingedShark
(Q: Why am I here? A: To do Justly, to love mercy, and to walk humbly with my God.)