I love my sister?

No not me, she and I broke up long ago.   No this couple found true love at the family home.

http://www.dailymail.co.uk/news/article-1315307/Ive-married-sister--having-second-baby-Siblings-defied-law-plan-start-new-life-abroad.html

For some it is okay even if it's not okay.    These two decided that they would wed, even
though they are brother and sister.    They already have children too.     OMg!