Could you tell me what a Proxy is and what it is used for?

Ok my father just friend requested me on facebook. I mean he is my father and I love him and all but... I don't exactly want him in my social life in any way shape or form. It this reasonable or should I get over myself and buddy him. Also this may open a gateway to other family members buddying me. In fact I am sure of it.

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Refluks