A teenage boy allegedly killed his software engineer father, his mom and three of his four siblings in their $2million Washington home, DailyMail.com can reveal. Mark Humiston, 42, his wife Sarah and three of their children were found shot dead on Monday inside their rustic mansion in Fall City by Lake Alice, about 30 miles east of Seattle, which has some of the most expensive homes in America. A 15-year-old boy was taken into custody after allegedly murdering five of the family's seven members. Police have not revealed the names or ages of the victims -- or their relationship to...