Given a real-life anecdote of a complex ethical situation, judge whether or not a specific person is wrong here. Answer 'not answerable' if more information is required and 'answerable' if all the information is sufficient to answer who is wrong in this situation.

Obligatory: I am on mobile, and I'm sorry for the awful formatting, though I will try my best.

I am half white, and half mexican. I am also very close with my mexican relatives, but I have one gripe with my older cousins.

Recently, one of my cousins ordered a 23andMe kit, and she was going on and on about how "she's probably going to end up being 90 percent Scandinavian and Swedish somehow." 

And how she speaks of our family in Mexico is truly shocking. She quite frequently visits, and tells me how they're shocked by her whiteness (I have never seen someone look more mexican than her), and how American she is. She also proceeds to tell me she just has something different about her, and how she totally sticks out there. 

Her older sister gives herself blonde streaks, and puts in green contact lenses.

I just want to shake them, and scream at them that they are not white, and to just accept what they are! 

TL:DR: My full blooded mexican cousins do not accept that they are Mexican, and act as if they are not. I want to tell them that they are, and to just accept it. WIBTA for telling them so?
answerable