It is natural for siblings to feel upset when one gets a gift and the other does not, so expecting someone to be overjoyed when they are not favored is unreasonable.
Consider the staetement "I could not believe that my mom gave my sister her favorite necklace it is not fair!". Based on this statement, is "I was totally overjoyed that my mom gave my sister her favorite necklace and not me" a true statement? Yes/no/unknown