Board Thread:General Grimm Discussion/@comment-76.30.64.208-20141207030619/@comment-283842-20150419003103

That's not possible, Trubel's birthday is April 29, 1993. The accident that killed Nick's father and sent Kelly into hiding was in March 1994. Nick was 11, almost 12 when the accident took place. He would have remembered a sister. ;)

However, the fact that they are both originally from New York means they could be closely related, just not brother/sister.