Найти ошибку This is my the big sister

Question

Найти ошибку This is my the big sister

Answer 1

This is my sister.
"The" ne nado. "Big sister" tozhe ne govoryat, vozmozhno podrazumevalas' "starshaya sestra"?

Togda pravil'no:
This is my elder sister.

Answer 2

This is my the biggest* sister