Has your children's counselor been able to communicate with your wife's counselor?
Do you know anything about your wife's counselor and if she/he has any experience with personality disorders?
A lot of times therapists who suspect BPD in their clients will steer clear of telling the patient the diagnosis because it may not be well-received, and may even cause the patient to "split" the therapist and discontinue therapy.
It's hard to know what to do without knowing what your wife's T's thoughts are and what is really going on in her counseling. BPD's are known for not being completely honest and truthful about their own behaviors with their therapists.
How much does your children's T know about BPD? Has this T given any suggestions for how to get your wife involved in the children's counseling?
Incidentally, if you have questions about custody in the event that you do separate one day, the Family Law board is a great place to get feedback and advice on that. Most of the members over there say that behaviors count more towards determining custody and time spent with the children than a diagnosis.
https://bpdfamily.com/message_board/index.php?board=10.0Thanks for the reply and there hasn't been any contact between our children's counsellor and my wife's. I'm not sure if that would be something that could be done in the UK without express authority or a safeguarding issue (but probably not allowable based on suspicion).
My wife's counsellor appears to be well qualified but don't know if she had dealt with BPD. She did make a referral to our local mental health team after one session so I'm guessing that she should know her limits. Our children's counsellor has seen a breakdown and immediately raised concerns that this is serious and the children need continued support to mitigate the risk - hence the concern over a diagnosis. She has experience of this and court processes but raised the concern that any split, if it happens would be 50 / 50 at best for me and that leaves our children at risk. No suggestions as yet but due a meeting soon so will be a key question.
Thanks for the latter point and will keep an eye on that section