Excerpts from the article:

A survey was done on Monkey3 from 31st October till 6th November and about 585 netizens particated answering the question ‘Who are the best celebrity siblings?’ and the duo Jessica–Krystal received 40%(232 votes) response, coming in #1 on the survey.

Survey result shows:

1. SNSD Jessica – f(x) Krystal
2. 2NE1 Sandara Park – MBLAQ Thunder (34%)
3. Kim TaeHee – Lee Wan (18%)
4. SS501 Kim Hyung Joon – UKiss KiBum (3.4%)
5. Go EunAh – MBLAQ Mir (3%)
6. KARA Kang JiYoung – NS YoonJi (2%)

credit: KBites