Hello Kitty no!!!!! I think they are too cute together to be related!!!! If they were something would most defintely be wrong!!!!!!

I answered this earlier, but then deleted it because I realized it was wrong. Rin and Len are whatever you want them to be; lovers, twins, friends. Anything. The company that designed them left that up to the listener to decide, so in your opinion they would be lovers. :) I think they're cute together, too

the kagamine's are twins but some people think there not.
but i think if they where not twins they would be a very cute couple.

I think they're both a couple and twins. Twincest~! XD

will if it's in manga and if there is a anime about vocaloid we will know for sure but until then as fans we can make them as anything we want twins friends lovers or just opposite

I think their related cause they look alike and have the same surname. But they were suppose to be twins Len was suppose to be Rin's mirror person but opposite gender