Tesla's insurance doesn't sound much different that the rest of Corporate America. I'm sure Cobra is available for his family.
COBRA FAQs - COBRAInsurance.com
It's not cheap but it is a bridge to get insurance on the ACA program. My company offers life insurance for salaried employees which is 1 year salary. I can get more coverage for a monthly amount.
The family should contact Tesla HR to understand what options and benefits they have.