Well Mena, to be brutally honest, I do not think this essay will produce much of an impact on the admission committee. The idea definitely works, but it should be better executed. You focused on your dad too much. What you should have focused on is your relationship with him. I can see that you've tried to do so, but you fell a little short; struggle a little more and you can reach your objective.
Oh and another thing wrong thing with this essay are the examples. Like the one about your dad buying your sister a laptop. Didn't work for me. Search for better examples, ones that include you. Make up stuff if you need to but make sure that they don't sound superficial. Honesty is not always the best policy.
I wish I could correct the small mistakes that mar your essay but I gotta go see obama!!
Ciao for now.
haha that rhymes
hassan