Hawking reached into his pockets and fumbled around a bit before he pulled out a photo and handed it to Sherry. It showed a man and a woman sound asleep in a laboratory. They both looked like they had worked long into the late night and had passed out from exhaustion. Though, if one looked closely, there were hints that they enjoyed each other's company.

"That is Father." Hawking pointed to the man in the photo.

There was no doubt about it. The man was William Birkin. His features were still recognizable even though he had clearly put on a significant amount of weight.

Hawking then pointed at the woman, "That is Charlie. Her and Father are friends."