A Motive

Normally by now, Julian would have headed back to his lab and waited for Roz to join him but he wanted to get a better look at his family. His daughters both had blue eyes like him, Ed also wore glasses, and he and Roz had hair in different shades of brown but he could still see the resemblance. 

All three of them were a perfect mixture of him and Izzy. He hadn't noticed that before. 

He wasn't at all sentimental but couldn't deny that they were good-looking children. Even Ed's missing teeth couldn't detract from that. Their genes had combined beautifully. 

Julian hardly knew a thing about them. He had been so preoccupied by other things since finding out he was a father that he hadn't talked to them much aside from Roz since she had been in the lab with him for part of the day Saturday after telling him the truth.