Sure, She-Hulk is related to Hulk. Jennifer Walters, aka She-Hulk, got her powers because of a blood transfusion from her cousin Bruce Banner, who is Hulk. This connection is a key part of their storylines in the comics.
One of the best Incredible Hulk stories is 'Planet Hulk'. In this story, the Hulk is exiled to a far - off planet. It's full of intense battles, as he has to fight his way through the planet's dangerous gladiatorial arenas. He also forms alliances and faces moral dilemmas. Another great one is 'The Immortal Hulk'. It delves deep into the darker, more horror - like aspects of the Hulk, with a very unique take on the character's nature and his relationship with the people around him. And 'Hulk: Gray' is also a notable story. It gives a more in - depth look at the psychological side of Bruce Banner and his transformation into the Hulk.