<human>: Can you give me the gist of the text in a nutshell?

My parents have had trust issues in their relationship for a long time now, and recently my mom found out that my Dad has been going to a place downtown every afternoon. 

The last couple of days she's been following him but hasn't quite seen anything concrete yet, just that he goes into an unspecified building for a couple of hours, then leaves for home.

Tonight, she told me all this, started crying, then lead the conversation to a "what should we do?" scenario. She wants me to help her with a stake out kind of situation, to report on his activities and maybe to break into his phone.

She assumes he's having an affair, and frankly, i do too (haven't said anything though)

The thing is, I'm the last son (2 brothers out of the house), just started university so I still live at home, I depend on them so I don't know if I should get involved in something like this since I'm the one who's going to suffer the most changes if anything comes through. What do you think?
<bot>: Mom asked for my help in uncovering Dad's affair, I still live at home so don't know the consequences of being involved in this matter.