YOU SAID:

my sisters bother is my uncle

INTO JAPANESE

私の姉妹はわざわざ私の叔父です

BACK INTO ENGLISH

My sister is my uncle on purpose.

INTO JAPANESE

私の妹はわざと叔父です。

BACK INTO ENGLISH

My sister is an uncle on purpose.

INTO JAPANESE

私の妹はわざと叔父です。

BACK INTO ENGLISH

My sister is an uncle on purpose.