It is clear from your son’s attitude that he feels no remorse for his actions.
I spun him a tale of deepest remorse when I joined his staff, fresh from my Death Eater days, and he embraced me with open arms — though, as I say, never allowing me nearer the Dark Arts than he could help.
Though he had shown no hint of remorse, it was possible that he felt sorry for how he had behaved before and was resolved to turn over a fresh leaf.
You have no idea of the remorse Professor Snape felt when he realised how Lord Voldemort had interpreted the prophecy, Harry.
There are no more uses of "remorse" in the book.
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There was no sign of remorse until the police caught her.