Tessio gets ground, or territory, after complaining about having no place to hang his hat. And on this ground he arranges Michael's assasination.

(Luca gets "grounded," to force an electricity analogy having to do with the knife, his hand and the bartop; Michael sort of gets grounded when he has to live in Sicily for a year. But it's Tessio who gets, simply, ground).

OKAY.

Though it's claimed that his huge heterosexual cock is what makes him special, the only time we see him in bed it's clearly revealed that he's given head to his sugar daddy.

PS: That genealogy question I overthought. I was gonna say Woltz...or Moe Greene, who also spits out a racial epithet, though less applicable as a reply to the question posed.