The brother indeed looked sketchy af, what with his emotionless attitude, his total belief in the prosecution case and his jokes to the media, but with victims' relatives you can never be sure, maybe they're heavy on medication and that's why they appear 'normal'.

What's with Americans and the "evil" thing? How does a person so "evil" not get into any trouble for 25 years while at high security US prisons filled with (proven) violent criminals?