Hi Rebeca:WELCOME:What bad traits do your various family members display? I'm thinking that the one person you can have the most influence on right now is your daughter. How old is your daughter? and what mental health issues are you currently seeing?
You can look at it from various angles:- Most people have a couple of the BPD traits, to some degree. BPD rarely stands alone, and it's common for someone diagnosed with BPD to have such mental health issues as: anxiety, depression, ADD/ADHD, bipolar and others. One school of thought is that when disorders aren't managed well (by meds and/or therapy), and coping skills aren't learned, the stage is set to evolve into enough traits to qualify for a BPD diagnosis.
- A lack of emotional intelligence (EQ) can set the stage for poor behavior (s). Children tend to mimic what they see. (which can be a totally broken version of normal - their normal) i.e. If parents or grandparents use "the silent treatment" , the children might evolve to use it as well.
- Mental health issues do run in families genetically. We can be dealt a bad hand in that regard, but how we play the hand can make a difference. (i.e. learning healthy coping skills versus unhealthy ones).
I recently heard an interesting discussion about teaching children to process their feelings. Feelings can change rapidly and that's a good lesson to learn. It's important to validate feelings. (i.e. I hear that you are very angry right now, that must feel uncomfortable for you). It's, also, important to learn ways to manage your emotions.
You can't change your sister or parents, but you can change how you interact with them and how you react to them and set your personal boundaries (that are for your benefit and that you have control over). There are a lot of good communication tools in the Workshop Section. A good place to start, could be with the links in the "Tools" area within the large green band at the top of the page.