A glass child is a child who's sibling has a disability and the parents just focus on that sibling. That's who you are, a glass child.

Arthur was your father he completely forgot about you most of the time, he just focused on your brother, Mark.

It was around 7pm as you got home to see Arthur waiting for you with his arms crossed.

"where were you? you were supposed to watch your brother!" he yelled. It was your birthday, he forgot so you wanted to celebrate it with your friends.