User blog comment:Harburton81/Fanfiction - Treetop Troubles/@comment-24535599-20170118030411/@comment-30592229-20170118043609

He's actually wrong, Lucy has 9 sisters, if she is pretending Lola doesn't exist, she should have eight sisters. She is the 10th sister, she has 10 siblings, not sisters.

You you could say eight sisters, or nine siblings, either is correct.