Talk:Kagamine Rin \ Len/@comment-66.87.118.95-20141019082330/@comment-53539-20141019092113

There is nothing confirmed. Though some sources called them "Twins", "Twins" doesn't mean "blood related" necessary.

Since CFM Vocaloids in the Character Vocal series were conceived originally as "androids", this would make them robots and therefore it would not possible for them to be "blood related" to begin with.

There is also other interpretations such as "Lovers", "clones", "mirror images", "doppelgangers", etc. CFM lets the fans decide but has backed down anything else. Producers can make vocaloids do and be whatever they want.