In my location, if you have terminated the tenancy and the tenant failed to move out, you have the right to file an unlawful detainer (eviction).

First, you need to be sure that an eviction (Unlawful Detainer action) is still the appropriate remedy.

It would be an unlawful possession suit.

I had a hard way to go on my first rental (legal, unlawful detainers, etc.) and got discouraged.

Calling someone out for doing something unethical or unlawful is not "snitching," it is holding people to a higher standard.

Then after that if you can not get an agreement on cash for keys, or you believe he is going to be out by the 60 days, then you will need to file an again for him unlawfully possessing the house at the 60 day mark.

There are some exceptions to thisIssue the 30 day notice, be sure it includes the advice that carry over will cause an Unlawful Detainer suite to be filed.

If you’re aware that the son is living there, you should name him in the Unlawful Detainer (eviction) action.

If the violations are not fixed then I will file an unlawful detainer action.

You can represent yourself (in pro per) without being licensed, but not someone else.Here's a few links on the topic: https://nathanmubasher.wordpress.com/2017/02/20/a-corporation-cannot-represent-itself-in-court-in-california/https://www.avvo.com/legal-answers/does-an-llc-need-to-be-represented-in-an-unlawful--367580.htmlhttps://kaass.com/california-corporations-facing-lawsuit-must-be-represented-by-an-attorney/https://www.occourts.org/self-help/landlordtenant/preparingyourcomplaint.html (this one is specifically about filing Unlawful Detainer complaints and says "If the plaintiff is a corporation, they must be represented by an attorney.")