Do I have to let social services in to my home if I'm on probation?

Unless your on probation for some sort of child abuse charge, you don't have to let them in. You are subject to search by cops and your probation...

How can i apply for citizenship?

Get a lawyer to help or apply using an N-400.

Is it legal for police to take a knife they find in a person's friend's house?

The knife can be seized in plain view. Never allow cops into your house and never talk with them. Get a lawyer if charged.

Am I still responsible for any unpaid rent if someone took over my lease?

I doubt you are responsible, but they may still try and collect.

I am needed legal advice on what is most beneficial step in turning a single member llc into an s corp.

See prior answer.

I am needed legal advice on what is most beneficial step in turning a single member llc into an s corp.

Contact a CPA or a Lawyer to help you set it up. Good luck.

Your not an adult until age 19, but talk with your parents. Parents can consent.

Your correct, your not an adult until age 19. Your parents may not like it, but it would not be illegal.

What r general documents and requirements needed to replace permanent resident card?

Get a lawyer or read the I-90 instructions.

Is it legal for an employer to give an employee a personal gift?

Not illegal to do this.