As a T1 mother of two children (diagnosed by my own mother when I became unusually thirsty as a child), I have always been a little paranoid about the possibility that my children might develop T1. However, I don't think traumatising your non diabetic children with frequent blood tests is a very good idea, so I controlled my fears by keeping a tub of urine testing strips and testing their urine instead of their bloods. As sugar passes out into urine once a blood sugar reaches 10, I reckoned that the urine would show up positive before they got sick enough to be in danger, and I could take them to the GP (or do my own blood tests).