When I was in 5th Grade we had a unit on immigration, and one of the assignments was to make a flag representing your ancestry. I was fascinated by the assignment, all the more so when the family discussions it led to revealed my ancestry to be more than the “German-Irish” I’d always been vaguely aware of. This was the first time I heard about Dutch and Danish ancestors. It was also my first exposure to the classic American “1/64th Native American” fib (yeah, wasn't true for me either).
One thing that stood out was my dad’s adamant statement that he had Scottish ancestry, though he couldn’t say precisely how other than knowing it was on his dad’s (mostly Irish) side. It wasn’t rigorous research, but it was enough for St. Andrew’s Cross to make it onto my ancestry flag as a late addition.