Sorry to hear about the upset with the family. It is tough, and it will be rare to find a member of this site who hasn't been where you are. I consider my family to be well informed and I'm not sure if some of them really understand my situation. For me at least, I was able to sheild my family from a lot of the characteristic BP behaviour so they weren't witness to the all of the upset I was able to create in such short periods. I think they've carefully filed away some of the darkest moments hoping to be able to move on. Some of the more devastating struggles I have kept private so they aren't able to understand the true gravity of the situation.
I think that most people are afraid to admit that their loved one is afflicted with something as potentially dangerous and frightening as BP. Especially considering it is such a chronic and unpredicatble condition without a single specific solution. Its hard for people to understand the daily battle and to comprehend the need and function of medication.
More often than not, I think that our families are reacting with good intentions based in fear and worry for our health and safety. They just don't realize what they think is helpful, isn't necessarily what we need to hear in the midst of a small crisis.
For me, its been important to try to come to peace with it, and I've had some luck talking it through with my dr. It helps being able to find an impartial party that you can talk with and help to unload some of the upset and find some understanding.
Take care of yourself and good luck with the family,