To cut a very long story short, my mother found some texts between my dad and OW on his phone. I haven't seen them, but from what I can gather, they're pretty explicit. She confronted him about it, and since then, he has changed the name in his phone to the name of a local theatre. A few weeks later, she found a ticket for a car park close to this local theatre, for a time when he said he was somewhere else. She has also found what she terms as 'long brown' hairs in their bed - she has bobbed blonde hair.
She keeps confronting him about these things - and he is saying that she is paranoid and doesn't trust him - denying everything basically.
My DB has known about this for a lot longer than I have, and is convinced he is having an affair. DM is now asking both me and DB to follow my dad to find out if he is lying.
Both me and DB have said that we don't want to get involved, that we're not willing to follow DF, because if we do find something out, we both feel we would be the ones in the wrong - if we find something out and tell mum, it feels like a betrayal of DF, and if we don't tell her, we're betraying DM, if that makes any sense at all. DM is now getting narky at both DB and me, when we refuse to drop our families to follow DF.
I am getting married later in the year, and DM had said she didn't want to 'do anything' before then. Fair enough. So I told her, from advice gleaned on here, to wait, continue to gather evidence etc, that he will only admit what she can prove. But she doesn't seem to be able to do that, and I am being deluged with daily texts about what she has found, and the row they have had when she confronted him about it. She has now text me something along the lines of 'so I'm supposed to say nothing when I find these things' and is refusing to answer my calls.
My brother and I considered getting the OW number, and calling her to inform her that DF has a family, grandchildren and that he stands to lose everything he's built for the past 34 years.
I just don't know what to say to her, or do. Do I stay out of it, or do I owe my mother some loyalty in finding out what is going on, considering how she was there for me when I went through a similar thing a few years ago. I think if I were to find out, for sure, that DF was having an affair, not only would I not want to see him, or the OW, but my DM would eventually end up resenting me for bringing about the end of her marriage.
Any advice? This whole thing is really getting me down. I am attempting to revise for an exam, work full time and look after my DD, and this is just too much