You've never had any children. You never really wanted them, but now you seem to have a few people you've come to care about as if they're your children. Him especially, you're glad you hired him. He's what you imagine your son could have been like if your life had been different. It wasn't too much of a surprise to discover that his other was the son of yours.
You're so proud of him, of everything he's done, and you would gladly call him your son here. It doesn't quite hit home for you until now, just how much you consider him as flesh and blood, until you see the security footage. Actually, it isn't that moment that decides it for you. It's when he doesn't tell you. The disappointment that fills every fiber of your being tells you that you love him as a son. You know you must reign yourself in before you speak to him. You do not want to push him away.