That is certainly...one opinion. You don't know what those people have been through, they could have had abusive parents for example and don't talk to them anymore. If the parents don't take care of the child well when raising them, I consider it more than fair to not take care of them in old age (or even simply once the child leaves the nest, so to speak). Taking care of one's parents is not an immutable law of nature (indeed, many if not most organisms simply breed and leave their children), nor should it be. That you implicitly "make a mental note to not be friends with that person" is quite telling indeed.