Backstory:
Mum was a nurse in the small moon base hospital.
Father was an engineer, working to keep the base operational.
When Braydn was about 14 his father grew slowly ill with some kind of degenerative disease. Loosing the use of his legs was the first stage of the disease, and Braydn would often accompany his father in his work maintaining the base, learning as he fetched tools, reached high places, things like that...
By the time Braydn was 17 his father was basically bed bound and in the full time care of his mother. Braydn actually signed on with the medical department to to try and research his fathers disease while he learnt to be a Doctor... unfortunately his father passed away before he completed his training.
After hearing about the success of the expedition to the moon lab Braydn has volunteered to go on any future missions, the idea of leaving the moon base, seeing what has befallen the outside world, perhaps leaving his troubles and grief behind... well it has appeal.