Who is Joseph from The Red Tent and what is their importance?

Joseph is Jacob's son, and admittedly his favorite, as Rachel is Joseph's mother. Joseph and Dinah are close as children, but as they become older, the two separate... Joseph with the men, and Dinah with the women. After Dinah is sent to Egypt, Joseph is sold into slavery by his brothers and ends up in Egypt as well. The brother and sister are reunited when Joseph's wife gives birth, and his sister is unknowingly acting as her midwife.