Both my parents have what , and continue having an impact on my life, but my father, Daniel has had the largest ones.
continue having isn't parallel with the previous verb have and doesn't connect with has had. The prompt asks for someone, so maybe just say out front, My dad has changed/made the most impact on my life (because he was always there for me when I was down).?
In both conditions, my father has been there to support me; having an impact on my life.
the second part after the ; is unnecessary because this is the person you're talking about. another thing, it's a dependent clause in need of an independent clause.
this whole time Daniel encouraged me, saying that it was all going to be okay in the end.
using your dad's name Daniel in this essay seems somewhat formal. I'm not sure if that's how you are, but using "he" would make it seem more personal
thru
through* haha. IM talk :]
I'm sorry to hear what you had to go through. a real challenge/adversity experience. I don't want to rewrite over your essay, but some things to consider, transition sentences, topic sentences for each of those experiences, maybe just a little addition about how your father was with you through that experience. This would seem like a difficult topic to write about. good luck~