Maybe I’m not being in the mind of a serial killer here, but personally I wouldn’t expect my parents or friends to come and witness my trial and be supportive if I’d killed innocent people (especially babies!) bad enough killing anyone, let alone little babies. I just can’t fathom how her parents keep coming. I know she’s their baby but wow. Bet it was a mic drop moment even for them in court for them too if they hadn’t known of the drafted letter for the third surviving triplet 
