I was saying that you can't be insulin sensitive and insulin resistant at the same time. They are like opposite sides of the same coin. Someone with double-diabetes is insulin resistant. They have to inject lots of insulin and are definitely not insulin sensitive.
The doctor seems to be suggesting that the same thing as is wrong with family members is also a problem for you (insulin resistance), except that there are no symptoms. It is some how lying dormant, getting ready to pounce

. To me, that is a bit of a stretch. Like most illnesses, insulin resistance is defined by its symptoms. If there are no symptoms, there is no disease.
Here is an article about double diabetes
Type 1 Diabetics Can Get 'Double Diabetes' From Insulin Resistance, Says University Of Pittsburgh. Here is another one
'Double Diabetes' a New Threat | LiveScience