Do I have to divide my zakat?

I owned around 700 US dollar for 1 lunar year. Now as far as I know, I am obliged to pay the zakat for this 700 dollar which is 2.5% of the amount. Now how should I divide this money for the zakat? Should I pay my full zakat amount to a needy person in my family? Basically paying one person the whole amount of the zakat? Or should I divide it in equal parts and pay to different category of people. Like some part for the poor outside my family, some for the poor inside my family etc. Please help me on this confusion in the light of quran and authentic hadith.