Dad's boss used to have sex with my mom and is now doing it with my sister?

Anonymous
Back when I was younger, my dad was always angry when his boss made him work overtime. He was always saying he hated him and my mom too said he was a dick. Although when dad wasn't home, his boss woud sometimes come over to our house to "give mom something from dad's work". When I was young I didn't realize what the noises were but when I grew older, I knew that they were fucking every now and then. She always said to never tell dad about it, that it would be a big problem for his work. She didn't make any effort to keep it down a little though. When I was a little older I think I kinda understood mom cause she was a lot younger than dad, she was very attractive and I don't think she and dad had a lot of sex (often didn't sleep together). I'm pretty sure she didn't have any other relation with dad's boss then sexual since she never saw/talked to him outside the bedroom and thought he was a dick. For about 10 years now I think, it stopped, or at least it didn't happen often. Also mom isn't in her 20's or30's anymore and, although still good looking, she's not the catch she was back then. (To make things clear she had me when she was 18, my sister a lot later.

My sister is 18, she lives with me in an appartement, studies and in the weekends makes some money waiting tables and sometimes modeling for clothing stores. So I thought she has her life together since she's smart and pretty. No a couple days ago, I walked into our appartement and caught her and dad's boss fucking. They were too busy to notice me so I quickly left. I talked to her about it after and she said he was at the bar where she works and was hitting on her. I never spoke about the whole thing with mom and this guy, but now my sister? she's half his age. Should I tell anyone? Maybe mom? I can't believe that dad's boss is such a pig. It's just really extreme. What do you guys think my course of action should be? I really don't think it will help anyone if I told dad.
Dad's boss used to have sex with my mom and is now doing it with my sister?
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