Protecting offspring, and relatives more generally, is an expected consequence of natural selection. It doesn't require any kind of intelligence, compassion, or even consciousness. Witness the many ways plants invest in protecting their seeds, for example.
What's interesting in this context is caring for the elderly, disabled or injured. The article mentions a case where a killer whale with a broken jaw was fed by other members of its pod. As far as I know, this kind of behaviour is only known in a few large mammal species.