It is NOT POSSIBLE to co-parent with a narcissist.
BM is always going on about how DH is in constant violation of their CO because he won’t co-parent (their CO, like I assume all COs, does not specify co-parenting, parallel parenting or any other type of parenting).
So this weekend is BM’s custody. She has refused to take SStwinB13 to his soccer practices on her Friday nights, and has told DH that he is expected to take this child to soccer on her custodial Fridays if the kid is ever to attend these practices. I see now that this is simply one of the many narcissist plots to stay “in the dance” with their former partner.

A couple weeks ago, during her custodial time, BM told SStwinB13 that he was not allowed to play in a tournament about an hour south of us (we live @20 miles south of BM) this weekend. Because DS13 and DD12 were here last night so that their dad could attend a work function, DH agreed to take SStwinB13 to practice last night and keep him overnight. He thought it would be the only soccer SStwinB13 would get this weekend.
So of course this lunatic/erratic parent of a BM went back on her punishment and decided that SStwinB13 WILL in fact be playing in this tournament. She then demanded that DH bring him back 20 miles north, so that they can get in a car and drive right past our house to this tournament 80 miles south.

When DH told her that she should just pick up on her way to the tournament (as DH drives this 20-mile trip to her town twice and sometimes three times daily on his custody days, depending on which practices either twin has- and SStwinA13 plays for a football club that practices 25 miles north of HER), she told him that he had “...already held SStwin13 ransom last night...” and that he “...need(ed) to get him here 9:00-9:30am...”.

Of course she had been texting SStwinB13 about this last night, and the poor kid was really upset about either the constant drama or the possibility of not playing or both. So DH drove him up and has said from now on, her custody is her custody and unless he needs to take kids because she’s out of town or they have a double-booking where each has a game in a different place, he will not be doing anything to help get them places when it is HER JOB to get them places on her custody.

He explained last night to me that it is gut-wrenching for him to constantly watch his kids be put in the middle of her vicious insanity. This and 1,000 other things she constantly does to keep them connected must be really hard for him to break the cycle of- but I really think for his sanity he needs to figure out how to do.

Almost ten years later and this is still going on.