Just for reference, Ernie's mother is Ooky's grandmother (and Tinker's great-grandmother). The original Yukonjak dogs (mostly Bearpaw and SkyFyre) are in all my dogs, multiple times - especially in Ernie. Cascade's Sabre Bear (mostly Williwaw/Targhee and very old Wakon) is Ooky's grandfather - and Ernie's great-grandfather (although Ernie is older than Ooky) - and ultimately Tinker's great-grandfather. And, the Snowlion in Ooky and Tinker, is obviously heavily related to the original Yukonjak dogs as both began with Sky Fyre, a working kennel (who showed, too).
So, if you have three generations, as heavily related as I do, clearly the smart choice is to test all of them, if you are breeding from any of them. Fortunately, all three have many, many working dogs from the few working kennels out there (Sky Fyre, Snowlion, Storm Kloud, Strawberry Mtn, etc) and anyone who works their dogs, doesn't want 'sick things' on a trail or pulling ...