Modernized Slavery

I am at a family function literally today, in a medium sized town in South India. I was surprised to see that one of my cousins(twice removed) had a helping hand, but I couldn't help noticing that they mistreated him so much, he literally broke his back working and doing everything for like 20 hours, and these people pay him 100 rupees 'honorably', and made him come through a dark, back garden path ridden with snakes just for his dinner, and made him sit outside even then, and this happened like 5 minutes ago... I was afraid to ask anyone but I know this is severe casteism and untouchability.... How can I as a person stand up to this problem to my family and fix it? (Or atleast find a way for the poor old man to be treated better?) This made me feel sick and repulsed, maybe because I'm from abroad, so I just wanna know, is this the norm?

Edit: some people are saying using 'hand' is wrong so I'll just clarify, I meant like a general help and servant.... Also I don't really know much about India, we only moved here a couple years ago and before that we only visited in the summers... So most people including the help don't understand half of what I'm saying.... Also I'm a kid, so I don't really know where to get money. I treat everyone equally, and do ask them if they need anything.... It just made me feel awful to see this. My parents did bring up the fact that they also saw that the relatives were mistreating the servants but they didn't say anything else. Thanks for the advice. I'll try my best but I don't really want to agitate everyone for visiting a place for like 4 days a year. I've made it pretty clear that I don't want to really interact with these random family members when I grow up... And anyways I won't be in India then. Tbh, it seems like these people in my family are pretty much losers in average to mediocre jobs and lives. To get a feeling of superiority they're mistreating this help so much. Idk how to put it but yes, all it takes for evil to spread is for good people to not say anything, so I'm gonna speak out and try to help. Again, thanks for the advice and I'm very grateful for the platform.