First of all, please fix the names on the Puzzle:

“Jacob jumped off the top” &  “Alexis falls on the safety”. I don’t know if this is knowingly put there or just a simple mistake.

Moving on,
There are 2 victims and 2 perpetrators.
Victims: 1. Jacob (guy who DIED) 2. WIFE (who survived). So, only focus/importance lies with JACOb here.
Perpetrators; 1. The HUSBAND 2. The SON

Jacob dies bacause Husband fired the GUN. But, he thought the gun was unloaded. So, actual person responsible for Jacon’s dying is the SON.

However, in court, attornys need to prove that SON did this on purpose and husband didn’t know, it is the only way the SON would be convcted for Involuntry manslaughter.. BUT…BUT if they fail to prive this in court, they will have to charge the Husband with the murder.

……
How did I do?