Ismene reminds her that she will be killed if she tries to bury him, but Antigone simply says "My brother, and yours, though you may wish he were not," reminding Ismene that they have a duty to bury their kin which transcends and nullifies the orders of the king. The reference "though you may wish he were not" is meant to remind Ismene and the reader that justice may come at a high price, may force one to act in a way which will upset one's whole life, and even cost one his or her life. The justice of honoring the dead and one's own kin, the justice of honoring the gods who call for such a burial, is the true justice, shaming the poor and corrupt "justice" which Creon proclaims. In addition, the strange occurrences which accompany Antigone's second attempt to bury the body (at least with a cover of dust) that she is indeed favored by the gods, that she is doing the right thing while Creon is doing the wrong thing.
Ismene suggests burying their brother will be a crime, something to be ashamed of, an act against the justice which Creon represents. Anti
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