Talk:Bolin/@comment-86.43.163.244-20111206164025/@comment-121.44.217.252-20111227000032

They are blood-related. It's quite common for siblings to appear un-related. My brother's and I look nothing alike, but we've all inherited the same blue-coloured eyes and different traits from the family. We actually resemble our cousins and grandparents more than our parents. Besides, the writers have confirmed that they are from a multicultural family.