「父 (ちち)」 means "father" (my). You use this word when you are talking about your *own* father to someone else. When referring to someone else's father, you typically use the more polite 「お父さん (おとうさん)」.

自分(じぶん)の父親(ちちおや)を指(さ)します。私(わたし)の父(ちち)は医者(いしゃ)です。