I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear that this happened.
The judge has discretion to revoke a person's probation for any violation, even relatively minor ones. So, yes, it is possible. Whether it's likely depends on multiple factors, including how much longer he has on probation, how many violations there have been, and whether the probation officer thinks revocation would be best under the circumstances.
Instead, they also have the ability to extend his probation or add additional requirements. For example, the judge could order him to complete an alcohol education course or similar treatment within 30 or 60 days and provide proof to avoid having probation revoked. It's not uncommon for the judge to give people another chance at these hearings.
What can help is for him to talk to the probation officer. Frequently, the judge follows the PO's recommendation, so it can help to either get him on your side, or to find out what he's thinking so you can better argue against it.
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