My Father Planned To Leave My Mother With Nothing After Exploiting Her

This is long winded but please bear with me.

My mom and my father were arranged together and married with a massive age gap. My father's children from a prior marriage were already adults by the time I was born. My mom is in her 60s and my father is older than the fucking president, but I want to emphasize that he is mentally lucid (there will be more on this later).

My father abused my mother my whole life. He exploited her labor as a free maid basically. She did everything for him--cooked, bathed him, dressed him, he doesn't even take his own socks off because he made my mom do it for him, despite that he is a grown man and is able bodied. He made her do manual labor on his rental properties in the 2000s (said properties were sold and the money pocketed by him and his children later). He made her do everything. He physically abused her as well. The only reason my father has lived this long is because of her.

There have been arguments lately about my father's assets. He is very secretive and hides everything. He hid money in the house and garage, he hid financial and business decisions and would only involve his other children, if my mom ever brought up money he would threaten to kick her out despite the fact that she had his child (me) and this dynamic continued throughout my whole life. I was helpless to do anything because I was literally a kid amongst his adult children, and had no idea what was going on until I myself was an adult, and my father isolated my mother from the world, her english wasn't proficient enough to navigate these things.

I recently found out that the house we live in right now, that I grew up in, was not purchased in my father's name. He purchased it in my half brother's name in 2002. He has no record of ownership of this property, which means that once my dad passes away, his corpse will barely go cold before my half brother is going to force us out of the house, since it was always "his property" despite having never lived here.

My father also collected all the money that was hidden in the home, and in the garage, and either distributed it to his other children or hid it somewhere. I don't know where any of the money is anymore. He never planned to leave my mother with anything. I couldn't get photos of the money in time, it was stacks of many tens of thousands, likely hundreds of thousands of dollars in cash in a toolbox. Like some shit from a movie. There was money hidden similarly in other places as well. He planned to leave this world having had free labor in his final years, and leave my mother and I essentially at the whims of his other children who openly hate us, he knows this and doesn't care.

He also continuously lies about how he uses his finances, like recently making up a story for a government agency that he pays my college tuition. I use financial aid and student loans. He lies about where I live, for what I don't know. Constantly tells us to be grateful he pays the bills, like the fuck is he gonna do if we weren't here? Not pay for electricity? He also pays for his own health insurance while leaving me and my mom to navigate medicaid and food stamps. He has financed purchases of multiple vehicles, homes, and business properties for his other children and their own offspring. He opens accounts with his children and puts his money there, uses lockboxes, who knows what else. One of his sons in particular, the one who's name is on the house, has access to all his assets here and overseas and likely has his name attached. They know this, and constantly assert authority over me and my mom because they literally got everything. They brag about kicking us out of the house one day. My half brother inserted himself into everything financially. We had a villa from my childhood overseas that he built an apartment on top of so he could demand half ownership of that property, and it was sold after screaming at me to do it since my name was there and he couldn't remove it. I received some money from it, and my dad told my mother that if she wants money she can ask me for it because she shouldn't expect anything out of him. He also took 20k from me after the sale. I have no problem sharing money with my mom. But I know that this is completely unfair to her.

The only possible recourse for this I can think of at least, is my mom to divorce. But my father almost never leaves easily accessible paper trails. All his assets involve the names of his other children, and he facilitates. He also often plays the role of a geriatric, unaware old man in front of other people to gain sympathy and to make things easier for himself. I have no doubt that he'd do this in possible divorce proceedings. I was also told that it is unlikely anything can be done at this point if his children already took everything, but I want to at least try to get my mom something for her years of suffering and dealing with these people. I already spoke briefly with an attorney but am also clearly looking here for any advice.