now.. I have 2 stepchildren with 2 different bm (yes I know fun fun fun) both of the mothers tell the kids to keep secrets and when they slip, we just tell them that if its a good thing it shouldnt be a secret,and that there is nothing that we say that cant be repeated, we notice that this relieves alot of stress for the kids as they are not trying to keep everyones secrets straight.... just yesterday my dear stepson told me, gee your not as dumb as my grandma says you are.(bm's,mother.. HATES dh and I(cause shes a control freak who controls every aspect of her daughters life and we will not allow her to control us or our relationship with ss)). I about fell over laughing, I figure kids are pretty smart and if given the right information as to what is right and what is wrong that they will figure it out for themselves and when there older looking back, it wasnt dad and I who did the secret telling trash talking, therefore no resentment towards us.
good luck
good luck