Inside Sling Box TV Streaming

Would this slingbox setup work?

This is somewhat complex but I think it would work so here it goes. Ok I dont have cable but my parents do and only have 1 tv so they have a few extra boxes since they came with their cable for free. I have an extra computer with an s video port on it. So could I plug in a sling box to one of their extra boxes put it on their internet then send it to my house and then to my extra computer which would be pluged into my tv with the s video port. Would that work and let me watch their cable?