YOU SAID:
I am the brother father of my oldest daughter
INTO JAPANESE
私は私の長女の兄弟父
BACK INTO ENGLISH
My brothers father of my eldest daughter.
INTO JAPANESE
私の兄弟は私の長女の父。
BACK INTO ENGLISH
My brother is my oldest daughter's father.
INTO JAPANESE
私の兄は私の最も古い娘の父です。
BACK INTO ENGLISH
My brother is my oldest daughter's father.
You should move to Japan!