Superman and Supergirl are two of the most famous heroes in DC’s lineup. Especially the Man of Steel himself. They both share similar superhero aliases and costumes but are Superman and Supergirl related?
Superman and Supergirl relationship
The short answer is yes, Superman and Supergirl are related. Supergirl is Superman’s cousin. Her real name is Kara Zor-El, and she comes from the planet Krypton just like Superman. Her father Zor-El is the biological brother of Superman’s father Jor-El. Kara was sent to Earth by her parents just before Krypton was destroyed just like Kal-El. However, Supergirl’s escape pod got caught in a meteor made of Kryptonite for some time, meaning Kara didn’t arrive on Earth until many years after her cousin. In fact, by the time she landed, Kal-El had already taken on his Superman identity.
Superman and Supergirl actually share a lot of the same powers. Both are superhumanly strong, fast, and durable. They can fly, shoot heat vision from their eyes, and even see through solid objects. The main difference between the two is that Superman has been on Earth longer, so he has had more time to hone his powers and become a more experienced hero.
To sum it up, Superman and Supergirl are definitely related. They are biological cousins through their fathers. They may not be siblings, but they are definitely family.

Who is older – Superman or Supergirl?
Well, it’s a bit of a complicated situation. Although Supergirl is older than her cousin Superman chronologically, she was stuck in a green Kryptonite meteorite for most of her journey to Earth. This caused her to be in a state of suspended animation, so she looks like a 16-year-old girl. Much like how Marvel’s Captain America didn’t age while he was in the ice for all those years. So yes, Supergirl is older than Superman even though she looks younger.