I also got the impression that they were making the sacrifices for the sake of their parents, not in their name (simply because I've never heard of people making sacrifices in their parents' names), but I think it's best to hold off on criticisms until we are sure of what really happened. And, even then, the best thing is probably to make du`a that they learn and understand the Deen properly, instead of just attacking them because they happen to be Salafis.