Just as a background info: My family is strange.
My father is working abroad and my mother knows he has fun with younger women (even of my own age, mostly his students), but - from what she has told me and her siblings - she silently tolerates it for "the sake of the family and the kids" (me and my 15 years younger brother).
I was brought up in a manner not to interfere or even express my opinion to my parents, so most of my life I have been passive when it came to "family issues". My only duty was to eat, sleep, study and mind my own business.
I'm an adult now and still living under my parents roof mainly because my university is just a stroll away from home. My moving out will occur when my whole family will relocate to yet another country, while I hope to continue my education or career elsewhere.
For almost 10 months now I have been affected by unknown chronic pain issues and that has contributed even more to my overall passivity.
Since about 4-5 months a young man, perhaps 3 or 4 years older than me, (introduced to me by my mother as a "distant relative") started coming to our place to help out doing chores and other work that I couldn't do due to my health issues.
He also started helping my younger brother with his school work and they have become great friends in the meantime. They are literally inseparable as he plays with him all the time, and he also allows my brother to use his laptop and play all video-games...
The only fishy thing was that my mother didn't want me to tell anyone (her siblings, her friends, etc. anyone else who came to our place) about the "distant relative", since they were angry with him about some ancient family tensions.
In any case, I am not supposed to ask questions, just do what I'm told to do and mind my own business... to the extent that sometimes my mother asks me to smuggle him inside the house or hide him when we have visitors.
I was starting to suspect something in the past few days, since this guy was actually using the house as if it was his own house and my mother also didn't seem to worry to walk in night clothes when he was around...
And a few minutes ago, before logging on, I was just casually walking into the kitchen and the door (which is usually closed) was open; with the corner of my eye I saw my mother and the "distant relative" together on the couch.
I walked on as if I hadn't seen anything.
My brother was just in the nearby room playing with this guys' laptop.
I wanted to take that laptop, smash it on that guys' head and kick him out of the house, forgetting all my health problems.
But I resisted the temptation and came back to my room to ask for your advice.
What would you do in this situation? Should I just live on and mind my own business as I was doing all this time?
Or should I act?
What I find a bit unjust is the fact that my mother is lying to my kid-brother, telling him that this guy is a relative, a distant "cousin" (i.e. my brother's and my cousin!), or whatsoever.
Or should I let my mother do as she wishes, since I'm anyway going to be out of the house very soon?
Thanks in advance for your advice.