Are you saying he intentionally rammed down the victims? Only that would justify a 24 year sentence.I stand corrected he faced 2 counts of first degree vehicular manslaughter, the max sentence is 15 years, he got 9 years for the mom and 15 years for the baby I believe. If it was deemed accidental then it would be 2nd/3rd degree manslaughter (someone well versed in the law can correct me on this)
If it was classified as a homicide then the max sentence will be anywhere between life and the death penalty.