A young man whose mother was killed alongside four farm workers in a crash in Victoria's north says the system is broken after the driver was jailed for just over five years.

A family has poured out its pain in court while awaiting the sentence of a man who ploughed his minivan into a father and his nine-year-old son.

A young man whose mother was killed alongside four farm workers in a crash in Victoria's north says the system is broken after the driver was jailed for just over five years.