Why would a man answer the phone like a woman??

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My father answers the phone like a woman. When I call him, I will ask to speak to him. And he will then ask me who this is, and I will tell him, and then he will say hold on.. And then about 30 seconds later he will come to the phone, with his regular male voice. I know that it is him, because once he told me that he disguises his voice because my half sister calls him and he is trying to avoid her. One time, I asked him whom that was answering his phone, he told me that it was a friend of my brother's. I asked him what is she doing over there, and he was like, Oh, she comes over here to visit him sometimes. But, I am telling you, that voice sounds really weird. It does not sound like a male or a woman's voice... It sounds like someone trying to imitate someone else. Why is my father lying to me? Why can't he just be honest and tell me that it is him doing this. I am his daughter.. He can be honest with me.. As far as I know, he is not gay.. He does not act gay.. But he just does odd things.. What kind of relationship does he expect to have with me, if he keeps on lying?