Getting abused will mess you up in all sorts of ways.
And in any case, someone as rich as Sam Altman letting a close relative live in poverty like that is by itself a pretty damning inditement of his character.
Google says the guy's worth $500M. A mere 1% of that in a trust could ensure that none of his siblings would have to live in poverty ever again. In absolute numbers that's a lot, but in relative terms I've given away much larger percentages of my net worth to relatives, including ones more distant than siblings, I'd do it again, and I'd think less of anybody who wouldn't do the same.
You don’t see any other possibilities? Not, say, paying her rent (or, realistically, buying a house with his spare change and letting her live there) or chipping in for therapy? His net worth is estimated to be in the half billion range so he’d never even notice the cost.
I'm not prepared to assess people's personal business, and I believe it's inappropriate for us to discuss their relationship as none of us are privy to their personal history, who paid for what, who approached who or approached not, and so on.
This thread only exists because you did feel it was appropriate to comment. My point was simply that you assumed one of the worst options rather than something more charitable.