A precept is another word for a warrant or an order from a judge directed to a specific person.
Served means that the process server (probably a law enforcement officer) served the recipient with process.
Without knowing the context, it is difficult to provide more information.
If you have an attorney, you should ask your attorney.
If not, consider calling or visiting an experienced local defense attorney.
Is your relative on probation or parole?
Is your brother being ordered to pay child support?
Is he current with those payments?
Is your brother behind in paying court ordered fines, fees, or court costs relative to a criminal conviction?