I'm sorry you lost your Father OP.
I lost my Dad three years ago, and have just found out that Dad removed my db and I name and added his stepson and half sister for inheritance when I was a child, they got 13k each, my bro and I, the stepmum, hundreds of thousands. My db and I nothing. There were other horrible vile things said to my bro (I went nc with them all not long after dad died) It hurts, not that we don't have money, but being left out, that rather than add his stepson and half sister to share, he removed us, and stepmum and step bro say this because he didn't give a shit about us.
I know what you mean about the phone calls, I couldn't grieve for my dad as stepmum would ring all the time crying, and if I mentioned I was struggling I was called selfish.
Is the money important to you? If your family are making you feel shit, would cutting contact be an option? You know what your family is like, and if they are going to be nasty, and say horrible things to you, I don't think any amount of money can make up for the stress and anxiety that arguing will do.
For me, cutting contact was the best thing I did. They didn't get to see how I crushed I was after hearing the poisonous voicemail left for my bro. My step family may have a small fortune now, but they are very very bitter and twisted, I'd rather be me, than them iyswim.
Feel free to PM me if you want to talk or just vent 