When Rehoboam arrived in Jerusalem, he mustered the whole house of Judah and the tribe of Benjamin ... to make war against the house of Israel1 Kings 12:21
The house of Judah separated with the tribes of Benjamin and Levi and are now the modern day Jews. The house of Israel are the remaining tribes who chose to follow Ephraim and Manasseh, and were later taken into bondage and became the missing ten tribes of Israel. Three from twelve is nine in my book, so why are they called the missing ten? Why during the division did those who followed the combined tribes of Joseph become called the house of Israel?
Genesis 49:28
All these are the twelve tribes of Israel, and this is it that their father spoke unto them and blessed them.
And BTW, Joseph went to help bury his father and returned to live out his life in Egypt. His dying words were for his brothers NOT to leave his bones in Egypt. So during the Exodus, they did indeed gather Joseph's bones and carry them back to the land which G-d promised them. That land was and is ISRAEL.