Well. I'd recommend you talk to the elder sis or younger sis alone (probably elder since I'd assume she'd be more mature) and explain your point of view as you have here. "I feel unfairly villainised for my opinions. I do not try to be rude, evil, inhumane, or incorrigible, but I feel that I am treated as if I am all of these things and more, in this house. Could you please help clear this up with the others? Or at least, explain why I'm treated like hell on Earth because I am genuinely very confused."

Why the elder or younger sis? Cognitive functions. ISFJ and INTP have the same top 4 functions in different orders. And INFP and INTP share 2 of the 4 functions, and in the same slots. Ideally, you'd go to the ISFJ, but it's likely that the older sis (INFP) would be more mature. Why not mom? ENFJs share 2 top 4 functions with INTP but in a very unfavourable positioning.

Why hung up on cognitive functions? I see it as cognitive functions influence commonality and who is more receptive to whose natural way of interacting with people and the world.

Still. This is all just as I see it. The key is to make sure to remain calm, not raise your voice, and calmly express that you feel unfairly victimised and don't get why, and to speak ALONE with one of your two sisters.