Legal Question in Credit and Debt Law in California

Don't talk to them. If they were to actually sue your husband, or record a lien on your home after suing your son, this would hand you a free lawsuit against the collection agency.

You might have an attorney write them a letter and provide them with evidence that your son is not your husband, and that they'd be wise not to place a lien on the home bearing your husband's name on title. In that way, they're on notice in writing not to slander title to your home. Mr. Stone is correct that you shouldn't talk to them, though.

Mr. Stone would be correct, except I would send them a letter now, short and sweet, certified mail, that simply states the facts. If they then proceed to sue you or your husband, which they would have to do to get a lien, you will have a major and very win-able lawsuit against them for abuse of process and unfair debt collection practices.