Mahhhy are the children being exposed to anything inappropriate as far as you are aware?
If they are, then by all means seek to address your concern.
If they aren't then, IMO not your circus, not your monkey's.
You really want to save fighting this battle for when it really matters, and when you really have to. Like if the children ever talk about something that places their safety (emotional, psychological and physical safety at risk of actual harm).
My experience tells me that if you address your concerns for the above reasons your XW will be perceive you as being petty, jealous and intrusive into what she considers her business. You lose any ground you potentially have made, in keeping a positive co-parenting relationship intact, also you lose the impact and power of any intervention you may absolutely need to make in the future, if you address the small stuff to frequently. XW will just dismiss you all the time if you raise things too often.
In addition if you mind yourself through this sitch right now with OM, when it eventually turns to custard, she can't fire any bullets your way, stating that you contributed to it.
Right now, you need to be seen as the hero and that means having virtue, and behaving in such a way that your intentions and character cannot be called into question.
Let just me say though, if you think your children are at serious riks of harm, go hard!
