[identity profile] ethelmay.livejournal.com 2014-10-18 12:35 am (UTC)(link)
Oo. You're right. It would be 25%, about the same as a half sibling.

[identity profile] ethelmay.livejournal.com 2014-10-18 12:44 am (UTC)(link)
Except wait, she's actually a great-great-niece, I think. So 12.5 is right.

[identity profile] mindstalk.livejournal.com 2014-10-18 02:20 am (UTC)(link)
Or grandchild. :p

(Great-grandchild, given the correction.)