Communal altruism is a thing in science already, where the rate of altruism is still high even amount no related individuals if they live in close knit communities. Bats was the big example, where they would share their blood meals with others in the same colony even if they aren't related, but they nest together so they are effectively family. Pods are usually related to a large degree so the rate of altruism would already be beneficial to be high since their own genes are being propagated technically still if they save another member of the pod.
But that's just the raw science of it. There are far more complex interactions involved that we simply will never able to quantify, or not at least for a long time. There have been reports of rituals coming up up in some species but it's kinda a delicate topic because scientists dont want to be ridiculed for talking about ideas that can't be "proven." Altruism is theoretically not a trait that would be passed down, since it usually would decrease their fitness, but the truth of the matter is so much more complex. I also fully believe spite exists and can continue among wild populations, especially after working with raccoons, little fuckers. It's an interesting few chapters for sure, it certainly delves into things I don't even see American scientist talking about, let alone Japanese ones