The practice of live-in maids has been somewhat common throughout the world up until WWI and into WWII. Well-to-do families would taken in boys and girls from poor families and use them for house and yard work. It wasn’t slavery, or even indentured servitudes, but it did take opportunity of their misfortune. Aristocrats and well to dos would take girls and boys mostly from the less educated countryside or from war-torn areas of the rest of Europe and use them as cheap labor. Some would stay on and some would go off to seek better future outside those families. It was somewhat symbiotic the poor kids (and their families) needed the money and the wealthy could show off they had money to spend on domestic help.