Should I add the lady my father had an affair with on facebook?

[FloozyBoozy]

No. She has disrespected you and your entire family by sleeping with a married man. She may not be a "bad person", or was just acting out of love, but I would not be able to forget that kind of disrespect. If your father wants to be with her so be it, but I would not want anything to do with her.
Don't feel obligated to "connect" with her, she is your father's partner, not your mother.

[Taylor White]

Well, it's your decision on accepting it or not. I personally would not and I don't see how she could be upset with your choice in not accepting it..

If you feel uncomfortable around her in person, she may make you feel the same on Facebook. She potentially could comment on your photos, statuses, etc and say things that make you more uncomfortable.

As someone else said, you could always accept her and set it to where everything is out of her view. Do not make yourself more uncomfortable by adding her and making it awkward for yourself.

[Merrywool932]

Yes and on her wall I think that's what it call tell her how she tore your family apart and how she should be ashamed to sleep with a married man

[jcf6865]

How can you call her a "lady", she is more like the tramp?