I recently took a class on helping children adjust with failing marriages. Their advice was to never (NO MATTER WHAT AGE 6 months - 56 yrs old) expose children to the sorid events of the affair. Now in my case, my foggy WS decided to take our kids to dinner and tell them he was marrying the OW. Now, of course, he hadn't filed for divorce... nor had he even told me everything yet. OH WELL... now my kids 12 and 9 are having a very difficult time... my son blames himself since my H met her at his extra-curricular activity... (her son and my son are in the same sport). Anyway, it's just gone from worse to ugly.. so IMHO, which btw, isn't worth much these days... I would keep it from the kids if you can. I know that it is easy to want the kids to side with you... to know exactly what their mother is doing or about to do to their lives, however, speaking from experience... I would like to jerk a knot in my WS's aspirations each time I look at my son's face when he tells he dad to give up his gf. I would do anything to spare my son from that...more likely than not the kids will find out anyway if you decide to expose the A... esp... if you are from a small town (seems everyone knows). I have told my inlaws (who say they just want their son to be happy and want to stay out of the middle... of course, they've also told me he really can't love me and do this to me so I should just cut my losses and be happy too... interesting isn't it?) My parents didn't help either... they have tried to be supportive of me of course... but my dad is so angry he won't speak to my H and now family get togethers seem impossible) I think if I had my druthers I wouldn't have told anyone but my therapist.... because now everyone is full of advice but noone has bothered to say anything to him. So it didn't work out well for me when I exposed the A... just ended up making things much worse.... b/c noone wants to help they just avoid us or offer so much advice to me it drives me crazy...
That's my two cents worth... good luck