"It is" is a bit misleading.

I will say it was common up to the end of 70s and somewhat into the 80s. Common here I don't mean that every single person would have a "slave child" at home but you'd know someone or someone that knew someone who did it.

I am not saying it justify this horrible behaviour, but mostly as to say how much worse it could get. Some would just be "Cinderella" style abuse, but other would be physically and sexually abused.

Some reform of policies around de 90s cleared much of the evil practice.

I think by today standards, 99% of people knowing this would have denounced this much earlier. The fact it did not happen in this case is because this family is related to a powerful politician of the region.

Compensation they offer is too little and too disrespectful. It is basically 3 USD a week for the past half decade of forced work relationship. First, it would need to be at least 100x more than that and it would need to put this rubbish in form of people into jail for the rest of their lives.