You must control him and let him bear the normal living expenses, at least you can't let him do it with your salary. There is no other way. Also, you can change him (her) from futures to stocks, which will greatly slow down the shrinking ability of funds. This is also a process of detoxification.
Futures are easy to make money and easy to lose money, so people are easily addicted. But in terms of probability, if you win 100 times, you will lose it all at once. If you don't have the ability to withdraw money continuously, don't try.
Good luck.