Content of the comment parent in email notification

How do I get the content of the comment parent in the function wpc_email_sender() ?

I want the email shows the initial question and then the answer.

I trying this:

$comment = get_comment($wpc_new_comment_id);
$parent_comment_id = $comment->comment_parent;
$parent_comment_content = get_comment($parent_comment_id, 'comment_content');


but not working.

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