Thanks TTD180. Yes I accept the W is having an affair, the family also accept it. I now know the sons also know this. The W is still in a fog where she believes simply stating "we are friends" is an acceptable reply to all people concerned. I got to speak to the SIL and ex best friend last night. I learnt a lot of what is happening, how I am coming across (especially to my sons) and what changed everyone's views back in June/July last year. I will write that up another day. For now though, I will wait for a few replies and then ponder my best action with regards to the party.
ME:51 W:46 M:25 S:22, S:20 Divorced 16/9/15 BD 10/12 W left 12/12 with OW, affair confirmed Nov/12. Dark since 6/13 I"m in a new relationship since Feb 14.