Martha Kate Morgan has three older brothers and lives in Sydney, Australia. She been performing from a young age. She started taking ballet lessons when she was just three years old. It was Martha Kate's youngest brother, fellow actor Ned Morgan, known for Sleepwalking (2018) who got Martha into acting. Before even commencing kindergarten, Martha Kate tagged along to drama classes with him from the age of five, after he announced that he wanted to be an actor. At first this was just for fun, however two years later they both found professional representation.