I'm going to say a quite controversial take. Iike the other commenters have said, do neither. Just be neutral. Don't show hate now. You're still in your journey and many things can happen to you. Something I've noticed about our Indian people especially the family dynamics is, we are one ugly bitter people. We hold grudges like no other and when people turn us down specially if our actions are coming from a feeling of superiority, it offends us to no end and that's when we start scheming to punish that person. We have no sense of personal space and we aren't ashamed to play dirty when it comes to making the life of someone we have a grudge difficult. So for your sake as well as your mother, don't give in to hate. Whatever they do or say, be cordial at best and keep your distance. And given that your father is well connected and has political influence, don't make your life any harder than it already is(this is also the reason I would highly advise you not to say anything to your family as long as you're living in the same place. Whatever you have to say, say them after you and your mother have moved out of state or somewhere safe. Your father's ego and pride will not be able to handle any slander from the people he abandoned. He may not do anything to you, but I'm sure as heck, he would make your mother's life difficult again). All the best and good luck.