<human>: My bf suggested posting this on Reddit could get me the help I need. Sooo, the back portion of our house has been rented out to a divorced women with 2 kids for over three years. My parents have been married for 25 years but just recently I have become suspicious that my father may be cheating on my mother with our tenant. I feel he may be doing this out of sexual frustration. He has always spent a lot of time back there fixing the sink, or the toilet, or working on something...but I never thought anything of it.

My room shares a thin wall with the tenant's living room so I can always hear everything. I am 100% sure the affair is going on but I do not have physical evidence. I want to kick out our tenant Asap. But I am the 20yo daughter and I may not have that authority. Telling my mother is not an option for reasons I cannot say, but I want to end this affair asap. I am also avoiding talking to my father about this.... it's embarrassing, especially in my culture. I have always loved my dad tremendously and he raised us well, and I don't want this to change our family. I hate him but still love him at the same time....how should i get proof? And if I do, how should I respond?

Provide a brief overview of the text.
<bot>: My dad is cheating on my mother with our tenant. How should I catch them and then how should I proceed without my mother knowing?