I think my 26y.o Arab teacher banged my mom during my last year of school

I think my 26y.o teacher banged my mom during my last year of school XD

I finished high school last year at 17 (now I’m 20) During my final year, there were parent-teacher conferences; when the meeting which was supposed to be between me, my mother, and my teacher was taking place, the teacher sent me out after a while so he could speak to my mother alone.
I thought it was odd but went along with it.

The next day, when my mom got home from work, she said she had to drop something off at my teacher's place?. She told me not to wait up because it would be late, since according to her he lived quite far away (which later turned out to be a lie, because he mentioned that he walks to school). I didn't question it until... the next day, my mom texted me saying she was going on a trip with her girls for three or four days, and my teacher "coincidentally" took time off at the same time?.
That was the moment I had my first dirty thought, but I immediately dismissed it because for context: he was 26 (a new teacher fresh out of university) and my mom was 41. I have an older sister who was 23 at the time, so I thought it was unlikely she’d be dating with a man whose age was closer to my sister’s or even mine than her own. So, I just put it down to coincidence until she came home a few days later and I happened to be doing everyone's laundry; I noticed dried “white stains” on my mom's bras and panties. + my teacher was back the next day, grinning at me in a way he usually didn't, and he even accidentally called me "yā ibnī" at one point? I didn't understand it at the time, but when I looked it up later, it turned out to mean something like "my son" or "my boy” I think, in Arabic (he was Arab)

Even though it’s been a year since I left high school, I can’t stop thinking about it and if it really was what I think it was.
But I mean, she’s a beautiful Russian woman and she was really relaxed at this time, so even if it was what I think, good for her...

What do you guys think?