HP Spolier-y Stuffs, actually just theorizing...
Harry Potter Fans on ye olde f-list, check out this post by alegriagraciela for some interesting speculation on the Black Family Tree.
Look at how many existing families are on there though... Flint, Crouch, Burkes, Bulstrode, Potter and Longbottom. We know from the books that the Prewetts (Molly's maiden name) are on the tree and that the Malfoys through their connection to Narcissa are on there.... does this mean that Marcus Flint has some (ancient and convoluted though it may be) relation to Draco, and for that matter, Harry, Neville, and Ron?
Look at how many existing families are on there though... Flint, Crouch, Burkes, Bulstrode, Potter and Longbottom. We know from the books that the Prewetts (Molly's maiden name) are on the tree and that the Malfoys through their connection to Narcissa are on there.... does this mean that Marcus Flint has some (ancient and convoluted though it may be) relation to Draco, and for that matter, Harry, Neville, and Ron?