Thank you for the added information. It helps a lot. I believe I can now be of help with this issue.
I can imagine how frustrating this situation must be for you. The most effective way to describe what you are experiencing is to draw on the family systems theory of Dr. Murray Bowen, who was very renowned in this area. And we're going to focus on one of the 8 interlocking concepts that comprise his important theory: triangles.
Triangles are the basic shape of stable relationships. Three. In a set of three, you have two that are in harmony and one in conflict. This is the basic family dynamic. In the family, two members will band together to give each other support and to exclude one member who is the "other", conflicting part of the dynamic. Your father as you so aptly said, is outside this triangle.
Here is a non-technical site that discusses his theory. And here's the page on that site on triangles:
Now if you and your mom and sister went to family systems therapy, you would all gain a lot. I'll give you a directory of therapists, but my sense is that this is not the right time for you to undertake this project. You're in the middle of creating your independent life away from the family. And that's good.
Given that I think you are not in the mode to undertake the therapy it would need for all of you to get past this triangle that has been created, I think you need to be accepting and seek your self confidence not FROM your family relationships but from your individual self and life and use that self confidence to strengthen your family relationships. to be more patient and accepting. It is easier to be accepting when you are self confident. And so remember:
Your confidence is not going to come from or be strengthened by your family, especially mom and sister. You need to bring your confidence INTO the family dynamic. Okay?
Here is the web address for Psychology Today's therapist directory. You can sort by zip codes and when you see someone who seems like they might be helpful (because they seem smart and not so easily manipulatable!) look at the listing and see if they list family systems therapy in their orientations.
Good Therapy is a non profit directory. Same idea as the one above:
Maybe one day all 3 of you will be ready for this. I don't' know. I have a sense you will make your own way and your own life and that is good. Take the time instead of therapy perhaps, to study a little Bowenian family systems theory and be a smarter part of the triangle!
Okay, I wish you the very best!
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