I am involved with a woman , whom I have deep feelings for , has recently discovered that her daughter @ 15 yrs. has a BPD . I am ignorant of this illness and how best to understand it and be an effective support person.  
 
Unfortunately ,I have been involved in the inappropriate behavior issues at their peak. When the daughter was out of control to the point that violence to her mother and her self were at hand . I interceded to prevent an unfortunate event from happening which could ruin either daughter and or mothers future . 
 
Needless to say The daughter resents me because I have always been there when she gets out of control and puts herself and others at high risk. She gets combative ,verbally and physically, with her mother and even with law enforcement.  
I have stood in between the physical assaults and verbal assaults as she tries to over power her mother. In my approach to these issues I have tried to ask my self how much is normal teenage independence and how much is willful miss-behavior or where does the illness take over. 
Still searching for the answers. 
The daughter and mother are in intensive therapy and Mom is stressed to the max. There are other mental health issues with an older son which she is trying to work with as well. 
 
The daughter has spent several weeks in childrens physc. during her meltdown periods.  
The she was tested by a physicologist within the last two months and the final results were  
made known this past week. 
The mother is a professional in Speech Therapy and working on her Doctorate in Education and the inequities of education in the public sector. Mom has more than a full plate and yet her most important oncern and responsibility is to her daughter and her wellness and safety. I have said all this only to help understand how important her daughter is in mom's life . 
 
I have had to be very cautious in contacting Mom as the daughter gets belligerant to her mom. 
 
It is my very limited understanding that persons with BPD resent authority of any kind and will  
go off at any indication of authority over them. Is this correct ?  
 
I would sincerely appreciate some enligtenment on this illness.  
 
For those of you who suffer with BPD my heart goes out to you and those you hold dear. I would be first to agrree we all need greater understanding and patience and prayers for strenght for the difficult days.  
Thank you for any response in advance. 
Have a brighter Day!!!