The card name came immediately, then I built the design around the card. Obviously I was looking at the families of New Capenna, and examining the cards shows the 'family is family' protective ideal is most expressed by the Brokers.
Next part is what the card actually did. Now, the main influence is the dreaded Banding keyword. It's fine if you don't know what that does, but it involved someone who isn't the owner of a damage source distributing damage. The family shoulders the burden and protects the members with solidarity... but then I noticed this effect could be used to explicitly redirect damage to kill one of your creatures. I liked it, and that's where the flavour text came from.