I believe the neighbour is pregnant for my dad

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I’m convinced that my neighbour and my father have something going on. It’s going on 2 years that my dad and I have been living in Johnsons village and not once have I seen a man other than my father enter my neighbours house.  One time he pretended that he was going down the road, parked his vehicle around the corner and went over by the neighbour.

From ever since I discovered that she was pregnant she has been coming over very often to ask for things. I can even recall my father giving her money on several occasions. 

My father is single and I am almost 20, so I really don’t understand why he’s lying to me about it. The only reason I can think of is, he believes that I am going to tell my mother which makes no sense because they separated earlier up in the year. This is really bothering me and I really need confirmation so my mind can be at peace.

I’ve come up with a plan to tell my father that I heard someone saying that the neighbour is planning on having an abortion and see his reaction. I really can’t think of anything else right now. I need a plan can anyone help me?