Now that Truble is in town, it would seem a good time to have her eyes tested for extra rods. Josh also, if he is still alive. If it shows up as a common trait, it could be used by Grimm parents/grandparents to see if the new child has the family curse. At a young age, they could be told Grandma Zozo had the same thing and 'she always said she could see strange things". They could be encouraged to take martial arts courses and shown the strange family books. Since it sometimes jumps a generation, this would be a way to prevent the kids thinking they are crazy when the monsters start appearing. They could let Dr Icu/Iseau "find" the condition and make the test known. As more reports came in, a reliable Grimm network would develop. Non Grimms would not know the gathering of the Icu's was a gathering of the clan for support, friendship, and a place for the young to meet acceptable mates(or who not to get married to, their choice). A blood test might show a genetic marker. Thoughts?