My brother is being a jerk when I ask him for help on a project, what should I do?

I'm in the Girl Scouts and I'm so close to getting my knot-tying badge. All I need is to present some pictures of me having used the knots, I've asked my older brother for help but he's being a jerk.

My brother is being a jerk when I ask him for help on a project, what should I do?
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