The Boleyns descend from a half brother of Godfrey de Boulogne and Baldwin I of Jerusalem.
Eustace II Count of Boulogne in addition to his 3 children by Ida also had a son out of wedlock, who's line moved to England where the surname Boulogne eventually changed to Bolyen.
I've also talked about how Eustace had documented descent from Charlemagne before.
The sisters Mary Boleyn and Anne Bolyen were also through their mother descended from the Howards Dukes of Norfolk. Who descend from the Plantagenet dynasty. Also at this time the ties between the Howards and the FitzAlans of Arundel were beginning, they hadn't fully become the same family as they are now yet, but regardless Anne and Mary were both direct descendants of Edmund FitzAlan 9th Earl of Arundel.
The FitzAlans were in origin the same family as the Stuarts, coming from Brittany in the time of William The Conqueror.
Anne Bolyen has no confirmed descendants alive today, but Mary through her two Carey children has many. Both Carey children were conceived during the time of her affair with Henry VIII, and had been observed to kind of resemble Henry. That she named the boy Henry is also interesting.
Wikipedia used to say of Mary.
"Mary Boleyn is a distant ancestress of many notables including Winston Churchill, John Davison Rockefeller, P. G. Wodehouse, Elizabeth Bowes-Lyon [the late Queen Mother and therefore the Queen], Diana, Princess of Wales, Sarah, Duchess of York, Charles Darwin and Thomas West, 3rd Baron De La Warr."
In the case of Darwin, I was curious if it's through Erasmus or not, it is through Erasmus wife it turns out, and that makes her also an ancestor of Francis Galton. The Rockerfeller and Churchill connections are of course very interesting to conspiracy theorists as well.
As far as the connection to the current Queen Elizabeth goes.
Mary Boleyn → Catherine Carey → Lettice Knollys → Robert Devereux, 2nd earl of Essex → Lady Frances Devereux → Lady Jane Seymour → Charles Boyle, 3rd Earl of Cork, 2nd Earl of Burlington → Richard Boyle, 4th Earl of Cork, 3rd Earl of Burlington → Charlotte Elizabeth Boyle, Baroness Clifford → Lady Dorothy Cavendish → Lord Charles Cavendish-Bentinck → Rev. Charles William Frederick Cavendish-Bentinck → Nina Cecilia Cavendish-Bentinck → Lady Elizabeth Bowes-Lyon (HM Queen Elizabeth The Queen Mother) → Elizabeth II, Queen of Great Britain and N-Ireland
I wonder if the Bolyen descent is why this Queen is the Second Elizabeth.