Contractor delayed commercial construction for more than seven months and how can i find lawyer to sue him contingency

Consult with a construction/real estate lawyer who can go over your case and give you an assessment.

In California, the law requires the landlord to refund the deposit in 21 Days. is it including holidays and weekends?

Yes, it is 21 calendar days.

My landlord is asking me for a letter stating my 16yr old is not living with us anymore due to complaints that he was a nuisance

Is your son listed on the lease?

If a landlord gives 60 days notice to terminate lease, can I move within 60 days without written 30 day notice on my part?

You need to look at your lease agreement.

I have a tenant who has not paid his rent since Jan of 2013. what should I do ? He also came in a threaten my husband.

Evict him and/or get a restraining order

Sounds like they did breach their contract with you, but what were your damages?

HIV

No you cannot legally demand him to get tested.

Who is at fault in this " car accident"? I was moving over to make a right hand turn and heard a honk. There was no collision.

Did you exchange information and has he contacted your insurance?

You should consult with an immigration attorney, as this is an immigration issue, not an entertainment issue.

Is it legal if my lawyer doesn't want to show me settlement draft/check on my personal injury because of rear end car accident

You have every right to see an accounting of the settlement funds and how they were divided up.