To my knowledge, Batman hasn't made a wish in the comics. His storylines typically revolve around his detective work and battles against villains through his own efforts.
The 2016 Batman graphic novels were special because they often explored different aspects of Batman's character. For example, some focused on his relationships with his allies like Robin or Alfred in a new light. They also had great art that really brought Gotham to life, with its dark alleys and imposing skyscrapers.
The first Batman comic book came out in 1939. Since then, Batman has become one of the most beloved and recognizable comic characters ever. The initial release sparked a wave of excitement and has led to countless storylines and adaptations over the years.
I haven't come across such a specific Batman story. But the Batman universe is so vast and diverse that there might be a lesser-known or indie version out there with this concept.
A 'batman fires robin fanfic' can be made interesting by exploring the complex relationship between them. Show the hurt and betrayal Robin feels, and Batman's inner conflict.
To make it unique, you could also play with the time period. Set the fanfic in an alternate timeline where Gotham is a more magical place. Baby Robin could have some sort of latent magical ability that he's not aware of, and Batman has to figure out how to deal with this new aspect while also protecting Robin from those who might want to use his power for evil. This would add an element of mystery and the supernatural to the fanfic.
To make it family - friendly, focus on the positive aspects of their relationship. For example, show how they support each other during the pregnancy. Batman could be protective in a non - violent way, like making sure Batgirl has a safe place to rest. And Batgirl could be shown as strong and determined to still contribute to protecting Gotham even while pregnant. Avoid any overly sexual or violent themes that are not suitable for family viewing.