Listing forks

It would be very nice if we could:

1. List the forks of a given upstream
2. Maybe allow syncing the list of forks with the list of local remotes?

One challenge I would see is to figure out which repository is the blessed one in the case one works with a fork of their own. But I personally love doing git fetch --all to pull the code of everyone I work with, and I would love it if there was a way for me to figure out which forks to add from the command line.