YOU SAID:

my sibling is wearing a red sweater that i gave her

INTO JAPANESE

私の兄弟は私が彼女にくれた赤いセーターを着ています

BACK INTO ENGLISH

My brother is wearing the red sweater I gave her

INTO JAPANESE

私の兄は私が彼女にくれた赤いセーターを着ています

BACK INTO ENGLISH

My brother is wearing the red sweater I gave her