Yes, shitcoins can do it, 25x growth is an impossible task with bitcoin these days, but shitcoins absolutely can. But high returns come with very high risk and if not riskier shitcoin investing than gambling, so this is not a good option for OP. Furthermore, even if he had more time to make that $75k, bitcoin would still not be an option. Bitcoin can offer good returns when held for long periods, but there is no guarantee that there will be only profits without risk. So the idea of investing to earn enough money to cure OP's brother is not a wise one.
I don't think it'll be wise if he invest in shitcoins, he can lose everything he has and that'll put him into depression which isn't good for his brother as he need him now than before. He shouldn't considered investment for this type of situation, what he needs is financial assistance.
He should tell his story to social media and media platforms, he could find sympathy and they help him by raising donations for him. He should keep that money and use to take care of his brother until he gets a permanent solution, we feel your pain and wish you the best.
He can buy Bitcoin worth $1000 and hold, it mightn't be big but if bitcoin gets to $100,000 or above this price the investment will increase and you can use the profit to keep taking care of your brother and family. Please update us when you find solution and I wish you the best.