You ask. It’s not rocket science. Even if it’s through an agency, if they speak English with anything then the US accent,then you ask if they have a legal right to work in the United States and ask to show their documentation. He’s responsible for anybody that comes into his house. He would think he would want to make sure that his possessions and his children were not in danger.
He knew.
Some illegals were brought here as children, educated here and speak perfect English. They don’t have an accent so likely would not trigger a question. Some of their documents are real documents so will pass a check- they just aren’t their documents. It is astonishing the background checks some illegals have been able to pass. Several years ago it was discovered that a Border Patrol agent was an illegal. He was using his brother’s documents and his brother was born here so was a citizen. The illegal BP wasn’t even suspected until he was caught assisting smugglers. Sometimes it is very hard to determine, sometimes it is more obvious.
I also think he would worry about the safety of himself and his family and their things; that is why most people use a so-called reputable agency to hire help that will have that kind of access. If he truly knew and didn’t care that would not only make him a supporter of illegals but would prove he is an idiot to put his family in harms way by allowing someone into their home they knew nothing about.