One important thing to remember is that your family (assuming they are eligible for the visa waiver program) will come in the country on a 90 day Visa. They MUST NOT overstay their visa, that creates all kinds of issues for the company and therefore to you!
There is a golden rule working for this outfit that must never be forgotten, the best thing is not to place the company's name on a negative light while you are representing it.
Otherwise this is a pretty liberal society!