Duh, his Dad said so, so that should be good enough. From the article:
On Dec. 9, 1834, Joseph Smith Sr. pronounced a patriarchal blessing on Joseph Smith Jr. wherein he declared that the Prophet was a lineal descendant and birthright heir to the patriarchal fathers Abraham, Isaac and Jacob, but more particularly Joseph of Egypt. Furthermore, Brigham Young declared that Joseph Smith was a descendant of Joseph through Ephraim (Journal of Discourses 2:269).
Side note: Their 12-year-old priests, aka every worthy boy, are "spiritually transfused" with the blood of Levi to enable them to hold the priesthood.
Sorry, but I am looking for a legal lineage. Do you have it?
I see that the claim goes back to Abraham. Therefore, I need the begets all the way from Abraham, through Jesse to Joseph Smith Jr. Please provide all the father's names through all the generations.
Surely you have it in the Mormon Archives?
Oh looky! Another anti-Mormon gang thread!
Nothing new though. Same old non-issues. /yawn