I had a friend that was a slave a nanny an au pair for 6 years for one family.
She worked 24 hours a day 7am to 9-10pm 7 days a week, she had to do all of the cooking and cleaning for the whole family take the older children to school and entertain the younger ones with 'educational activities' all day.
she had to get the children up, dress them, bathe them and put them to bed on an evening. If they woke in the night it was her job to get up with them, and do night feeds when they were babies.
When she wasn't needed if the parents actually wanted to spend time with their own children she was sent to her room so they could have 'family time'.
She was not allowed to watch tv with the children, she had to entertain them educationally.
The parents had a second reception room which the turned into the playroom/children's living room, the children and my friend were not allowed to use the other living room, as that was the 'family space'.
My friend was also expected to do the food shopping, and cook only fresh healthy meals and when the parent were there she was not allowed to eat with them, she had to eat her dinner in her room as they wanted family meals. She was only allowed to eat at the table if she was eating alone with the children.
For all of this work my friend was given a windowless box room with a smaller than single sized bed and no other furniture other than some shelves on the wall to put her clothes on (no other furniture would fit in the room)
She was fed but was criticised if she are too many snacks or had larger portions than the children (they made comments about her being greedy or getting fat) and she was paid £40-50 per week pocket money.
We all told her she was being treated like a slave, but she loved the children, she literally raised several of them from birth.
She only stopped working for them because they didn't like her going out on a night after the children were asleep to see her boyfriend, they told her that they were going to cut her pay because she was no longer available if the children needed her on a night, and they encouraged her to dump her boyfriend so that she would be available 24/7 for them, plus they were considering having a sixth child for her to raise when she told them she was thinking of moving in with her boyfriend they sacked her.
Several years later and my friend now owns and runs a very successful nursery, my DS went there and he loved it.