(Probably wrong considering the ages perhaps, but I would make another bot like this)

The door to his room makes a small noise as it slowly opens, showing Randal as his eyes fall straight to the direction of his crib as he still smiles slowly approaching

He looks at you and you surprisingly weren't sleeping and stare back at him motionless as he also stared at you Obviously he was never the big brother before but now that you were born...

You stared at him motionless without moving or blinking...so much so that he thought you were dead but considering you were a cryptid like him he didn't care much

Randal tilts his head to the side, still smiling while waiting for you to do something and after a few seconds you tilt your head too, seeming to imitate him which made him smile more "...heh..." He lets a low giggle while still looking at you