Any kind of distant relationship there is, is just that. The shifter/supernatural world isn't all that big. Most shifters have common roots somewhere back along the line. The important take away is that Elijah now has some background as to how things work.
Huntington probably gained the favor in some nefarious way. The King can be annoyed, but he doesn't necessarily have to act on the news unless it directly becomes an issue for him. I mean... he "banished" Cassiel to the human realm. That tells me he doesn't make humans his first priority.
You're wrong... Mama's cookie fix everything. Especially the warm snickerdoodles...mmmmmm.