Why doesn't Robby
have his father's last name? Why does he have his mother's last name?
shareThat's usually the case when the parents aren't together, child takes single moms name. Also, From the sounds of it his dad wasn't around/was a dead beat.
shareWas Johnny married to his mom or born out of wedlock. If that were the case then good chance he'd have his mom's last name (But not always)
share