At a circle house, there lived a family composed of the grandpa, grandma, father, mother, an 8th year old boy and his big sister. The father is an accountant in their city, the mother is a plain housewife, the grandfather is a retired army, the grandmother is a retired teacher, the 8th year old boy and his big sister are still schooling. You can really picture out the harmony and unity they've shared together. In fact, every Sundays, they're leaving for a picnic at Tagaytay just to have bonding and relax from their busy weeks.
Until one day the grandpa was murdered. He was found bathing with his own blood inside the house. Immediately the grandma called to the nearest Police Station to report what had happened. Right away the policemen came, together with Scene Of the Crime Operatives and National Bureau of Investigation team. Upon investigating, the grandma, the mother, the father, the 8th year old boy and his big sister were invited to the police station for explanation and further questions of the said murder.
When they've all arrived in the police station, the detective interrogate them one by one. The father said that he was in the office on the time his grandpa was killed. The grandma said she was busy reading a book at the corner. The 8th year old boy uttered that he was still in school on that time. His big sister said that she was in her classmate's house for their project. And lastly, the mother said she was cooking in the kitchen.
After hearing the family members' explanations, If you are the detective who killed the Grandpa? Why?
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