Is AUTHOR wrong in the post ? POST : Generic mobile apology, etc etc

My mom has been visiting my family for the last couple of days. While she's been here, she's been complaining about my dad's family. Recently, my dad's mother passed away and my aunt and her family have laid claim to everything she owned--her house, her possessions, etc. My mom is mad because this means that none of the other children or grandchildren (include myself and my siblings) have anything to get.

Here are some necessary details:
1. As far as I know, there was no will.
2. My dad's mother lived in another country, with the aforementioned aunt and her family, who helped care for her in her old age.
3. We have no relationship with my dad's mother. He married a woman of a different race, enraging my grandmother. She never had any interest in us because we are the black sheep of the family.
4. This aunt, when she visits our country, often stays with my mom and dad. Sometimes, she's here for months at a time.

Now I love family gossip and a good inlaw rant as much as the never person, but it started to aggravate me after a while. I told my mom, without raising my voice or being rude, that I didn't really want to hear any more. I don't understand how you can complain about someone and say that they're greedy and lying and then open your doors to them. It just felt like a lot of empty talk to me. I also don't feel like we had any reason to expect anything. My dad's mother had no love for us and it isn't like we ever tried to connect with her. Yes, it would have been nice if she had put her racism aside and taken an interest in us as we were growing up, or even just left us something small to let us know we meant something to her, but that didn't happen. And honestly, I don't want anyone saying they did me any favors, in this life or the next.

So anyway, my mom is upset with me because I said I don't understand why if she's angry with this person (my aunt), she would let her stay in her house. She said she's not angry, and I said that it sounds like it the way she keeps bringing it up.

My mom is an extremely giving and forgiving person, always willing to make sacrifices for someone else, but I think she lets people take advantage of her. AITA?