Ah yes, this garbage again.
So, to prove you are your parents' child, I suppose they would need to pop out another one identical to you?
Just like two parents can't produce another child with exactly the same genetics, you can't produce a distantly related descendent with the same genetics...
Not to mention that you aren't even starting with the same primate ancestors.
So to revise, you are asking for proof that your parents produced you by asking that your father's brother and mother's sister produce an identical child to you.
It's not going to happen. It doesn't work that way. You'll get something similar, with enough work and selective breeding and the occasional lucky accident, but it still won't be human.
Instead of that, we just use DNA testing and compare the results