GWS:Julia

Julia McWilliams is Landshark's sister. She is based entirely on the real-world Julia McWilliams (who later changed her name to Julia Child when she married). She really did work for the OSS developing shark repellant during the war.

I have no idea whether she actually had a brother or not. I am willing to bet that if she did, he did not develop shark-related superpowers.