hello, I am mixed race, my dad is fully amerindian and my mom is fully european

by that I dont mean that my mom recently migrated from europe, I am saying that she has european ancestry.

So I was the first of 3 siblings, and I look more like my dad because I am tan

but with my 2 other siblings it´s different

they look white, me and my siblings are mestizo (Mixed native and european ancestry)

So I ask if siblings can have the same 50/50 dna from parents and look more like one (in terms of skin color) than the other.

and if there can be a "Dominant" DNA, like for example European at the top and Native is second and viceversa, but you still have 50/50

And to prove I didn´t get sunburned, even in pictures where we were babies, my brother looks more white than me

I am not saying I am uncomfortable for being tan

I am just asking.

Thank you