Board Thread:General Grimm Discussion/@comment-78.72.160.162-20150328122307/@comment-82.21.236.214-20150531142318

Nick didn't develop his powers until Aunt Marie's cancer had progressed. Monroe said 'that'd do it'. Josh left soon after his father died, so we don't know if he became a Grimm. Trubel's fired after seeing both her parents killed, which would fit the Monroe pattern.

If there is a limit on the numbers of Grimm that would suggest magic on a hexenbiest scale perhaps akin to Greenwalt's other show 'unto every generation a slayer is born'.