forgery

I am in NY state. My daughter-in-law has signed my wife's name and withdrawn money from her account. She also forged her signature on various legal documents related to Section 8 rent. Furthermore, she diverted the Section 8 checks from our address to that of her parents.

What is the best way to prosecute these issues without an attorney?

Call the police. Tell them what happened. You wouldn't need an attorney unless you wanted to sue her.

When you call the police, have available all the documents you can possibly get your hands on. They will need an affidavit of forgery from the bank, and likely copies of any and all statements for the accounts referred to for at LEAST the time span of the occurences.

Carl