Joe Biden's Democrat great-great-great-grandfather owned a 14-year-old boy...

• Two of Joe Biden's 3x-great grandfathers owned slaves in Maryland
• The president has often touted his Irish Catholic roots, only a part of his lineage
• Biden also shares a small connection to Confederate President Jefferson Davis
• The story was adapted from a new book about the president titled The Bidens
• Politico reporter Ben Schreckinger penned the book coming out next week
• One chapter delves into Joe Biden's sometimes fraught history on race issues
• In one little-known incident, Biden actually lived in a deed-restricted home
• Covenant barred Delaware home from being 'owned or occupied by any Negro'
• Biden lived in the home from 1971 to 1974 as he launched his first Senate bid
• In 1986 Biden disavowed the racist restriction on the home purchased by his dad

Joe Biden has often shown pride in his Irish Catholic roots, but on another side of his ancestry, the progressive commander-in-chief's family lineage can be traced back to America's shameful past of slave ownership.

Jesse Robinett, Biden's great-great-great grandfather, owned two enslaved people in Maryland in the 1800s, according to a Politico story adapted from a bombshell new book, The Bidens.

Biden shares an apparent connection with Robinett through his full name - Joseph Robinette Biden Jr.

Another ancestor of Biden's also reportedly owned a slave in Maryland - a 14-year-old boy. That 3x-great grandfather is Thomas Randle, who held the child in 1850 in Baltimore County, according to census records and slave schedules at the time.

Slave schedules and census records were two separate headcounts of slaves that were conducted in 1850 and 1860.

The damning family history was uncovered by Alexander Bannerman, a West Virginia genealogist who organized the first complete genealogy of Biden for publication.

Census records resurfaced by Bannerman show that by 1860, Randle and his family moved to a different area of Baltimore County. The slave schedule for the same year shows he again enslaved a man.

Biden also shares a 'distant tie' to the wife of Confederate President Jefferson Davis.

A new book has delved into President Joe Biden's sometimes fraught history on racial issues, revealing that in the 1970s he lived in a home with a racially restrictive deed

The genealogist revealed that Biden's distant ancestor Allen Robanet likely immigrated from England to Pennsylvania in the late 1600s. Robanet is his link to Davis' wife Varina Anne Banks Howell.

For someone with deep roots to colonial America, Bannerman said Biden's family records showed 'not a lot of ancestors, and not a lot of slaves.'

DailyMail.com has reached out to the White House for comment.

But it's a past that Biden has infrequently - if ever - mentioned.

By contrast, the only Irish Catholic president since John F. Kennedy regularly invokes his Irish Catholic roots. Some of his most regular anecdotes involve growing up amongst his mother's Irish Catholic family and going to Catholic school in Delaware.

The book by Politico reporter Ben Schreckinger is due out next week

More recently he quipped at an event celebrating the Jewish High Holidays, 'my daughter married a Jewish young man. And you know, dream of every Catholic father that she marry a Jewish doctor.'

But at several points during his career, during attempts to woo southern voters, Biden has also appeared to boast of Delaware's history as a 'slave state' - seemingly before he was aware of his family's ties to...

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