Tell your children that they have absolutely no right to give you an ultimatum of this kind.
Some of them are parents, I expect, and ought to know that we do not stop loving our children, even when they are behaving badly.
Point out to them, that you do not approve of their brother's behaviour and that it is entirely up to them whether they continue to see and speak to him or not, but it is neither fair nor kind of them to penalize you for making a different decision.
However, stop lending your son money, and if you have proof of his stealing from you, report it to the police.
You are doing this son no favours by shielding him from the consequences of his behaviour.
And unless you have given your other children comparable amounts of money to those you have given the brother they are complaining about, get hold of a solicitor, and re-write your will stating that the money this son has borrowed and not repaid has been given him in lieu of anything you may have to leave, and that the rest of your property and estate is to be divided equally between your other children.
Your username explains how you die , how do you die?
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You never know, this may be the wake up call that he needs