I think everyone is saying the same thing, so I’m going to take another approach. Might help others in the future. I don’t know if the OP looked into this, but if a parent is enterprising enough, the parent can establish residency in California. One would have to eat one year of tuition at sticker price probably, but to me that’s worth looking into. Professions such as nurses, developers, police officers etc - can find a job within days.
A family friend from Colorado actually went the extreme and moved to California to work as a nurse at a hospital very close to campus (double the pay I might add) when her kid was still a senior in HS. Her kid really wanted to go to UCB, it was his dream school. She apparently also was sure her kid was going to make into UC-Berkeley. Kid had a 36 ACT and a 4.3 UC GPA. As it turned out, he amazingly got rejected or waitlisted, not sure, but got accepted to UCLA and went there instead. It still worked out, from a tuition cost perspective.
Would I make that sacrifice had I been in that situation? Perhaps.