Visitor Visa - B2

Hi everyone I want to share my experience and seek advise on my next interview.

My profile: I’m a 3rd year nursing student in university, 22, I’ve only ever travelled in school breaks never stayed more than two months, never extended my flight return dates. I went to get my visa renewed along with my brother because we both got our visa at the same time so it expired the same time. He is 25, his am entrepreneur help my father with his business. His last couple trips were very lengthy sometimes 5 months. My father is a government worker plus owns a business for almost 5 years now. He has enough funds to cover the entire trip.

The interview

Me and brother: Goodmorning sir
VO: could I have your passports please and confirmation paper

VO: what’s your purpose of travel?
Both of us: to visit our grandma for her 69th birthday

VO: what do you do?
Me: I’m a student
Brother: I’m an entrepreneur

VO: Do you live with your parents?
My brother: Yes
Me: no, we live with our father, stepmother and baby brother.

VO: what’s the longest you’ve ever stayed?
Me: 7 weeks
Brother: he didn’t answer

VO: I’m sorry but you are not qualified for this visa today.
Both of us left.

I was very shocked that I was denied and I think I was denied because of my brothers bad travel record and the fact that my brother wasn’t thinking before he answered so it looked at if we were lying when I really want lying. When he asked the length and my brother didn’t answer I’m assuming he is thinking it’s the same amount of time for my brother too which isn’t so before he had stayed way longer than that so he should’ve answered. Our first visa were as minors This experience was very confusing.

I plan to apply on my own this time but my father will accompany me on my trip though. Do you think I have a good chance by myself? I really need a vacation.