"Big Scary Monsters! Part Two of Father and Son" is the fifty-eighth issue in Fables.
Publisher's summary
Concluding the 2-part "Father and Son," featuring phenomenal art by Mike Allred (Madman). Bigby, Snow and the entire flock of cubs are back in the homelands, visiting Bigby's dad at the North Wind's Keep. Snow has put her foot down, demanding that Bigby work out his differences with his father, so that the cubs can have their beloved granddad back in their lives. But some sins aren't easy to forgive.
Plot
Ambrose flies and escapes the monsters, while Bigby transforms into his full form to get to the children. Meanwhile the other cubs catch the pig which Darien kills, but they notice Ambrose missing. Just when a monster is about to get Ambrose, Bigby in full wolf form comes out to save the day. Bigby huffs and puffs, ending the battle. It is revealed the monsters are actually Bigby's brothers, that take on different forms. Bigby and his family, including his brothers leave, they are turned into goldfish for the children's amusement and will remain like that forever.