Say hello to Jennyfer
Jennyfer is a half sister of the first Siamese - Blue Tortie.
Her dad is a Halloween starter, and her mother shows Foxie Chestnut.
Jennyfer shows Siamese Blue Tortie, which must be her dad's hidden fur.
She must therefore hide the fur she inherited from her mother, either the shown or the hidden.
This Tonkinese Blue Mink is also a half sister of Jennyfer, as they have the same mother.
Her dad is a Toyger Caramel, and her mother is a Foxie Chestnut.
Tonkinese Blue Mink is known to be dominant to Toyger Caramel, and must be Mom's hidden.
This proves that Siamese Blue Tortie is dominant to Tonkinese Blue Mink, and we have a proof that backs up most of the earlier assumptions.
Thank you, Terror, for helping me to dig this one out!