The possibility of terminating an employee during the current pandemic and the due rights

Hello,

Can a company terminate the employee without a valid reason especially during this pandemic?

How the gratuity will be calculated since he has been working with them for almost 5 years (will be completed in September 2020)?

Should he get more money in addition to the termination calculation since it is an arbitrary dismissal?

What will happen to his residency and his family members who are registered under his name?