Final answer:
The defendant's father was in jail for a year and a half due to a conviction and imprisonment sentence. The specific details of the crime and sentence are unknown without further information.
Step-by-step explanation:
The defendant's father was in jail for a year and a half because he was convicted of a crime and sentenced to imprisonment. The details of the crime and the specific sentence would require more information to determine.
In some cases, the length of a prison sentence can depend on the severity of the crime, the defendant's criminal history, and other factors considered by the judge during sentencing.
It's important to note that each case is unique and the specific circumstances surrounding the defendant's father's imprisonment would need to be known to provide a complete answer.