I'm so tempted to just name their dad John. I think I wanted to name him Eli, but I mean, John gets the point across rather well XD

he would have to have a more prominent role than poor Anna got.
Sam will! I just hashed out the Sam&Dean sideplot with hiza_chan below, and it kind of feels more cohesive than the Cas&Anna one at the moment.

I am already shipping Sam/Anna in this 'verse. They should just have a Dean/Cas/Anna/Sam love-in.