Nope, Vivian Jenna Wilson, Musk's adult daughter who changed her name and disowned him because of how he treated her as a trans person. Imagine how awful that must be to disassociate yourself from the richest man in the world.
You're basically forced to measure that as wealth. Otherwise we're just pretending someone is poor just because they're cash poor, yet I would argue that poor people have no real way to get 40 billion dollars to immediately lose money on a social media company.