Is Netflix any good, needs help?

I need help. I really want Netflix. I'm moving to Florida in 1 month.
 I won't have anything to do at my empty house tonight, I have the
T.V  The XBOX 360. We have xbox live. I've been begging, I love
watching movies  sometimes TV. But nothings on, I'm staying at my
grandparents house for a few weeks possibly a month and they barely
have any channels on comcast that are any good. The xbox is getting
setup on the TV upstairs, where I'm sleeping with my little brother.
We LOVE movies. We really need  want netflix on our xbox. How do we
help convince our parents within a week for it. HELP? 10 pt. best
answer.