Note on the actually complicated world of thralldom/ghouling/revenants. BigStuffedTiger has brought up good points as far as they go, but just real quick-
Generally most newly sired vampires will be minimum 1 step to a bond with the sire. There have been (in inspirational materials) cases where bonds have survived Vaulderie and or the Embrace, with the pre existing bond going deep under cover, requiring only a single pull to awaken, and a single dose of vitae to go back in full force. Likewise the breaking of bonds has been a full time endeavor for groups of revenant families for almost a thousand years. Revenants are bloodlines of super ghouls. They make their own vitae, have their own family disciplines, which are of course influenced by the clan that maintains them and or created them. Inspirationally speaking, and only the major clans, not blood lines, The Tzimisce created the process in modern nights, though there is the persistent rumor that not only Mages (as in that line of WoD books) arose from Seth, who also may well be a single dose empowered super ghoul of Caine, and that any of his kids were revenants of crazy power levels.
The Tremere stole a bloodline from the Tzimisce and tailored it to their needs. The final major clan to be known to have Revenants for sure are the Giovanni, which are blood sorcerers specializing in Necromancy. They have a habit of embracing family (genetic) members, and they as a family committed horrific sins upon their progenitor Clan the Cappadocians.
Both Osirus and Set are believed to have revenants out there somewhere, and the Assamites as well.
Forgetting Revenants which have made no appearances in Rebirth, we do have thralls, which the very easy definition is someone who receives a minimum of the 3 doses (barring any funkiness) of vitae from the domitor, and then a minimum of 1 per solar year. If they do not receive that single does, the blood bond (control) is broken. Thralls who do not keep a minimum of 1 point of blood (10% of their blood supply as BST pointed out ((except very powerful blood can alter this)) will age normally if thralled for less than 50 years, and at an accelerated rate the older they get, down to instant dusting for thralls that are 300-1000 years old. Ghouls, which we are taking to mean more meaningful companions/protectors/dependents of the vampire, would require more regular maintenance and a higher level of blood supply in order to be useful to their domitor. Right now, we do not have a good feel for how LikesBlondes is treating this, except for the loss of humanity and free will aspect of the more frequent feedings. The freewill loss depends greatly on how aligned the host and the parasite are to begin with. Andrew and Sharon could likely pump a lot more blood in, as they are on the same page. However there is evidence that doing this will have more dire effects on Andrew so we are left with the image at least, that Sharon and Andrew advocate starving the ghoul.
Ok enough spouting today, at least for now, wife arrived with starbucks!