Rautahat: A youth killed his mother and sister with a spade in Dharmapur of Rautahat today morning.  Nanda Kishor Yadav, 20, of Dharmapur-9, Pakaha killed his forty-five year-old mother Ramkali Devi and fourteen-year-old sister Anita Kumari Yadav by hacking them with an axe at around 10:30am.  According to Area police Office Garuda, Yadav murdered his kin on the way to the field to collect peanuts.  DPO Rautahat DSP Rajendra Pokhrel informed that preliminary investigation had revealed that the accused had been suffering from psychological disorder for the past three months.  “Nanda Kishor has been on run after the incident and  search is under way.