Killer Grannies The Next Trend of Tragedy

Gloria Nelligan a 43 year old grandmother is charged with manslaughter after allegedly beating her 8 year old grand son to death. Now the Connecticut State police suspect that 47 year old Debra Denison shot and kill her two young grandchildren before killing herself. Is this the next trend of the Tragedy? I haven't seen anything reported that Nelligan has had a history of mental health issues but Denison has. Maybe its time to learn the "cries" for help even if it is a whisper.