system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Do dogs have bonds within their families?

Like are they attached to their siblings or parents more than other dogs?
gpt
Yes. Most social organisms do. There is something called the Hamilton rule which was the first quantitative description of a phenomenon called kin selection; meaning that an organisms will risk its life (and/or ability to reproduce) to save the life (and/or the ability to reproduce) of those who are closely related. The more closely related the organism that needs saving is, the less likely the organism in question will risk its own safety and ability to propagate its own genes to save another organism. The rule is represented by the following equation: 
rB > C

"r" being the relatedness of the actor to the receiver of the altruistic action (a parent would be 0.5 for example)
"B" being the reproductive benefit to the receiving party
"C" being the cost to the altruistic actor

So if the risk is less than the benefit to the recipient times the proportion of shared genes (relatedness) the organism (such as the dog in your example) will put forth more risk in order to preserve those who are more closely related to them, than others who are not.