<human>: Can you provide a brief overview of the text?

Hi Reddit!

First time posting to this sub. I was visiting with my extended family this weekend and my grandmother who is 71 and has been married twice, tells us that she is talking to two different married men on, you guessed it, Facebook! One that she knew 50 years ago from her old neighborhood, who apparently is in the US "visiting family" and is going to take her to dinner. The other lives near her and they go out to social events and he apparently comes over to her house when his wife isn't around. He also calls her on the phone. 

My family is not pleased about this. My boyfriend suggested to my mom (her daughter) to ask if she would have been okay with either of her husbands hanging out with another woman when she was married. I think this is a good idea. I understand that she is a grown woman and can make her own decisions, but since her last husband was a loser that everyone (except her) was glad to be rid of, I don't want to feel like I'm just sitting on my hands. 

I should also add that she has had extreme mental issues in the past that she had sought psychiatric treatment for. She has recently told my family that she has taken herself off all her medications.

So Reddit, how do I/my family approach this? Should we just butt out and let her be, or should we try and talk to her more about this?
<bot>: Grandmother is having an "inappropriate" relationship with two married men, advice welcome on how family should deal with it.