Jemma/Elena/Katherine
So including the...Amara that Elena mentioned, that makes 4 of us in the Petrova line that I know of. There was another, before me, Tatia. I don't know much about her, the Mikaelson's would, but...I wouldn't suggest poking around about it. Bear, stick, they don't go together well. Plus Tatia is likely still a sore spot, she kind of wrecked things between the older two brothers. As is apparently in the Petrova genetic make up