Will keep this as concise as possible.
Dh and dad work together and, last week, dh caught a glimpse of dad's company credit card statement with a payment to a hookup site. I have done a little detective work and, sure enough, there he is, looking for, amongst other things, a private relationship. The thing is, there's not much info on his profile. I found him by signing up myself (with dh's knowledge) and searching my email contacts.
My mum has been happily married to this man for over 30 years. It is possible she knows about this (she has terrible arthritis and often has painful joints. That wouldn't help an intimate relationship, I assume) but I doubt she does. My mum is a strong woman with a lot of self respect. I really can't see her being alright with this.
So, do I do or say anything to either of them? He's raking her for high tea at the house of lords today.