If your sister is unwilling to talk to you, you can’t force her to do so. All you can do is suggest that she seek help. If she’s interested and wants to take your advice, she will. Otherwise, she may not. Unfortunately, your power is limited.
People have to want to seek help. You cannot force someone into treatment except in cases of imminent danger to self or to others. Short of that extreme circumstance, encouragement is your best course of action.
You might also try suggesting family therapy. Since these issues involve both your father and deceased brother, your family could benefit from counseling. Again, you can suggest it but the family would have to agree to participate. It’s not something you can force. Make suggestions but realize there are limitations.
Even if the advice your offering is good, it doesn’t mean it’s going to be taken. That is a difficult lesson to learn in life. I wish you and your family the best of luck. Thanks for writing.
Dr. Kristina Randle