In the case of twins, there seem to be no indication that they both must be either siphoners or regular witches, as evidenced by the existence of three sets of twins from the Gemini Coven—the twins Olivia and Lucas Parker were both born as regular witches, whereas their older twin siblings Josette and Malachai Parker ...
Is Kai Parker a Siphoner?
Kai entered the room and told them that he wasn't entirely without powers. He just didn't have any of his own. He revealed that he was siphoner, a witch who couldn't generate his own magic but could temporarily absorb it from others and then use it as his own.
Is Hope Mikaelson a Siphoner?
Powers and Abilities
She has been shown to be able to siphon from multiple sources even when some are rooms away at the same time. ... Her siphoning is unique in the fact that she does not require physical contact in order to siphon.